PHPLIB-330: Apply automatic fixes via phpcbf

src/BulkWriteResult.php

@@ -30,8 +30,6 @@ class BulkWriteResult
     private $isAcknowledged;
 
     /**
-     * Constructor.
-     *
      * @param WriteResult $writeResult
      * @param mixed[]     $insertedIds
      */

src/ChangeStream.php

@@ -17,13 +17,15 @@
 
 namespace MongoDB;
 
+use Iterator;
 use MongoDB\Driver\CursorId;
 use MongoDB\Driver\Exception\ConnectionException;
 use MongoDB\Driver\Exception\RuntimeException;
 use MongoDB\Driver\Exception\ServerException;
 use MongoDB\Exception\ResumeTokenException;
 use MongoDB\Model\ChangeStreamIterator;
-use Iterator;
+use function call_user_func;
+use function in_array;
 
 /**
  * Iterator for a change stream.
@@ -57,8 +59,6 @@ class ChangeStream implements Iterator
     private $hasAdvanced = false;
 
     /**
-     * Constructor.
-     *
      * @internal
      * @param ChangeStreamIterator $iterator
      * @param callable             $resumeCallable
@@ -109,6 +109,7 @@ class ChangeStream implements Iterator
         if ($this->valid()) {
             return $this->key;
         }
+
         return null;
     }
 
@@ -167,7 +168,7 @@ class ChangeStream implements Iterator
             return true;
         }
 
-        if ( ! $exception instanceof ServerException) {
+        if (! $exception instanceof ServerException) {
             return false;
         }
 
@@ -202,7 +203,7 @@ class ChangeStream implements Iterator
 
         /* Return early if there is not a current result. Avoid any attempt to
          * increment the iterator's key. */
-        if (!$this->valid()) {
+        if (! $this->valid()) {
             return;
         }
 
@@ -236,6 +237,7 @@ class ChangeStream implements Iterator
     {
         if ($this->isResumableError($exception)) {
             $this->resume();
+
             return;
         }
 

src/Client.php

@@ -17,27 +17,30 @@
 
 namespace MongoDB;
 
+use MongoDB\Driver\Exception\InvalidArgumentException as DriverInvalidArgumentException;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
-use MongoDB\Driver\Exception\InvalidArgumentException as DriverInvalidArgumentException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\Model\BSONArray;
+use MongoDB\Model\BSONDocument;
 use MongoDB\Model\DatabaseInfoIterator;
 use MongoDB\Operation\DropDatabase;
 use MongoDB\Operation\ListDatabases;
 use MongoDB\Operation\Watch;
+use function is_array;
 
 class Client
 {
     private static $defaultTypeMap = [
-        'array' => \MongoDB\Model\BSONArray::class,
-        'document' => \MongoDB\Model\BSONDocument::class,
-        'root' => \MongoDB\Model\BSONDocument::class,
+        'array' => BSONArray::class,
+        'document' => BSONDocument::class,
+        'root' => BSONDocument::class,
     ];
     private static $wireVersionForReadConcern = 4;
     private static $wireVersionForWritableCommandWriteConcern = 5;
@@ -147,13 +150,13 @@ class Client
      */
     public function dropDatabase($databaseName, array $options = [])
     {
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));
 
-        if ( ! isset($options['writeConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
+        if (! isset($options['writeConcern']) && server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -269,7 +272,7 @@ class Client
      * Start a new client session.
      *
      * @see http://php.net/manual/en/mongodb-driver-manager.startsession.php
-     * @param array  $options      Session options
+     * @param array $options Session options
      * @return Session
      */
     public function startSession(array $options = [])
@@ -288,17 +291,17 @@ class Client
      */
     public function watch(array $pipeline = [], array $options = [])
     {
-        if ( ! isset($options['readPreference'])) {
+        if (! isset($options['readPreference'])) {
             $options['readPreference'] = $this->readPreference;
         }
 
         $server = $this->manager->selectServer($options['readPreference']);
 
-        if ( ! isset($options['readConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern)) {
             $options['readConcern'] = $this->readConcern;
         }
 
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 

src/Database.php

@@ -17,17 +17,18 @@
 
 namespace MongoDB;
 
-use MongoDB\Collection;
 use MongoDB\Driver\Cursor;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\GridFS\Bucket;
+use MongoDB\Model\BSONArray;
+use MongoDB\Model\BSONDocument;
 use MongoDB\Model\CollectionInfoIterator;
 use MongoDB\Operation\Aggregate;
 use MongoDB\Operation\CreateCollection;
@@ -38,13 +39,15 @@ use MongoDB\Operation\ListCollections;
 use MongoDB\Operation\ModifyCollection;
 use MongoDB\Operation\Watch;
 use Traversable;
+use function is_array;
+use function strlen;
 
 class Database
 {
     private static $defaultTypeMap = [
-        'array' => \MongoDB\Model\BSONArray::class,
-        'document' => \MongoDB\Model\BSONDocument::class,
-        'root' => \MongoDB\Model\BSONDocument::class,
+        'array' => BSONArray::class,
+        'document' => BSONDocument::class,
+        'root' => BSONDocument::class,
     ];
     private static $wireVersionForReadConcern = 4;
     private static $wireVersionForWritableCommandWriteConcern = 5;
@@ -175,9 +178,9 @@ class Database
      */
     public function aggregate(array $pipeline, array $options = [])
     {
-        $hasWriteStage = \MongoDB\is_last_pipeline_operator_write($pipeline);
+        $hasWriteStage = is_last_pipeline_operator_write($pipeline);
 
-        if ( ! isset($options['readPreference'])) {
+        if (! isset($options['readPreference'])) {
             $options['readPreference'] = $this->readPreference;
         }
 
@@ -192,22 +195,22 @@ class Database
          *
          * A read concern is also not compatible with transactions.
          */
-        if ( ! isset($options['readConcern']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern) &&
-            ! \MongoDB\is_in_transaction($options) &&
-            ( ! $hasWriteStage || \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcernWithWriteStage))
+        if (! isset($options['readConcern']) &&
+            server_supports_feature($server, self::$wireVersionForReadConcern) &&
+            ! is_in_transaction($options) &&
+            ( ! $hasWriteStage || server_supports_feature($server, self::$wireVersionForReadConcernWithWriteStage))
         ) {
             $options['readConcern'] = $this->readConcern;
         }
 
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         if ($hasWriteStage &&
             ! isset($options['writeConcern']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern) &&
-            ! \MongoDB\is_in_transaction($options)) {
+            server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern) &&
+            ! is_in_transaction($options)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -228,11 +231,11 @@ class Database
      */
     public function command($command, array $options = [])
     {
-        if ( ! isset($options['readPreference'])) {
+        if (! isset($options['readPreference'])) {
             $options['readPreference'] = $this->readPreference;
         }
 
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
@@ -255,13 +258,13 @@ class Database
      */
     public function createCollection($collectionName, array $options = [])
     {
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));
 
-        if ( ! isset($options['writeConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
+        if (! isset($options['writeConcern']) && server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -282,13 +285,13 @@ class Database
      */
     public function drop(array $options = [])
     {
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));
 
-        if ( ! isset($options['writeConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
+        if (! isset($options['writeConcern']) && server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -310,13 +313,13 @@ class Database
      */
     public function dropCollection($collectionName, array $options = [])
     {
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));
 
-        if ( ! isset($options['writeConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
+        if (! isset($options['writeConcern']) && server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -417,13 +420,13 @@ class Database
      */
     public function modifyCollection($collectionName, array $collectionOptions, array $options = [])
     {
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 
         $server = $this->manager->selectServer(new ReadPreference(ReadPreference::RP_PRIMARY));
 
-        if ( ! isset($options['writeConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
+        if (! isset($options['writeConcern']) && server_supports_feature($server, self::$wireVersionForWritableCommandWriteConcern)) {
             $options['writeConcern'] = $this->writeConcern;
         }
 
@@ -484,17 +487,17 @@ class Database
      */
     public function watch(array $pipeline = [], array $options = [])
     {
-        if ( ! isset($options['readPreference'])) {
+        if (! isset($options['readPreference'])) {
             $options['readPreference'] = $this->readPreference;
         }
 
         $server = $this->manager->selectServer($options['readPreference']);
 
-        if ( ! isset($options['readConcern']) && \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (! isset($options['readConcern']) && server_supports_feature($server, self::$wireVersionForReadConcern)) {
             $options['readConcern'] = $this->readConcern;
         }
 
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = $this->typeMap;
         }
 

src/DeleteResult.php

@@ -29,8 +29,6 @@ class DeleteResult
     private $isAcknowledged;
 
     /**
-     * Constructor.
-     *
      * @param WriteResult $writeResult
      */
     public function __construct(WriteResult $writeResult)

src/Exception/BadMethodCallException.php

@@ -18,6 +18,7 @@
 namespace MongoDB\Exception;
 
 use BadMethodCallException as BaseBadMethodCallException;
+use function sprintf;
 
 class BadMethodCallException extends BaseBadMethodCallException implements Exception
 {

src/Exception/InvalidArgumentException.php

@@ -18,6 +18,10 @@
 namespace MongoDB\Exception;
 
 use MongoDB\Driver\Exception\InvalidArgumentException as DriverInvalidArgumentException;
+use function get_class;
+use function gettype;
+use function is_object;
+use function sprintf;
 
 class InvalidArgumentException extends DriverInvalidArgumentException implements Exception
 {

src/Exception/ResumeTokenException.php

@@ -17,6 +17,9 @@
 
 namespace MongoDB\Exception;
 
+use function gettype;
+use function sprintf;
+
 class ResumeTokenException extends RuntimeException
 {
     /**

src/GridFS/Bucket.php

@@ -19,17 +19,40 @@ namespace MongoDB\GridFS;
 
 use MongoDB\Collection;
 use MongoDB\Driver\Cursor;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\GridFS\Exception\CorruptFileException;
 use MongoDB\GridFS\Exception\FileNotFoundException;
+use MongoDB\Model\BSONArray;
+use MongoDB\Model\BSONDocument;
 use MongoDB\Operation\Find;
 use stdClass;
+use function array_intersect_key;
+use function fopen;
+use function get_resource_type;
+use function in_array;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_resource;
+use function is_string;
+use function method_exists;
+use function MongoDB\apply_type_map_to_document;
+use function MongoDB\BSON\fromPHP;
+use function MongoDB\BSON\toJSON;
+use function property_exists;
+use function sprintf;
+use function stream_context_create;
+use function stream_copy_to_stream;
+use function stream_get_meta_data;
+use function stream_get_wrappers;
+use function urlencode;
 
 /**
  * Bucket provides a public API for interacting with the GridFS files and chunks
@@ -42,9 +65,9 @@ class Bucket
     private static $defaultBucketName = 'fs';
     private static $defaultChunkSizeBytes = 261120;
     private static $defaultTypeMap = [
-        'array' => \MongoDB\Model\BSONArray::class,
-        'document' => \MongoDB\Model\BSONDocument::class,
-        'root' => \MongoDB\Model\BSONDocument::class,
+        'array' => BSONArray::class,
+        'document' => BSONDocument::class,
+        'root' => BSONDocument::class,
     ];
     private static $streamWrapperProtocol = 'gridfs';
 
@@ -193,7 +216,7 @@ class Bucket
      */
     public function downloadToStream($id, $destination)
     {
-        if ( ! is_resource($destination) || get_resource_type($destination) != "stream") {
+        if (! is_resource($destination) || get_resource_type($destination) != "stream") {
             throw InvalidArgumentException::invalidType('$destination', $destination, 'resource');
         }
 
@@ -228,7 +251,7 @@ class Bucket
      */
     public function downloadToStreamByName($filename, $destination, array $options = [])
     {
-        if ( ! is_resource($destination) || get_resource_type($destination) != "stream") {
+        if (! is_resource($destination) || get_resource_type($destination) != "stream") {
             throw InvalidArgumentException::invalidType('$destination', $destination, 'resource');
         }
 
@@ -333,7 +356,7 @@ class Bucket
         $file = $this->getRawFileDocumentForStream($stream);
 
         // Filter the raw document through the specified type map
-        return \MongoDB\apply_type_map_to_document($file, $this->typeMap);
+        return apply_type_map_to_document($file, $this->typeMap);
     }
 
     /**
@@ -353,9 +376,9 @@ class Bucket
          * the root type so we can reliably access the ID.
          */
         $typeMap = ['root' => 'stdClass'] + $this->typeMap;
-        $file = \MongoDB\apply_type_map_to_document($file, $typeMap);
+        $file = apply_type_map_to_document($file, $typeMap);
 
-        if ( ! isset($file->_id) && ! property_exists($file, '_id')) {
+        if (! isset($file->_id) && ! property_exists($file, '_id')) {
             throw new CorruptFileException('file._id does not exist');
         }
 
@@ -532,7 +555,7 @@ class Bucket
             ? $updateResult->getMatchedCount() === 1
             : $this->collectionWrapper->findFileById($id) !== null;
 
-        if ( ! $found) {
+        if (! $found) {
             throw FileNotFoundException::byId($id, $this->getFilesNamespace());
         }
     }
@@ -562,7 +585,7 @@ class Bucket
      */
     public function uploadFromStream($filename, $source, array $options = [])
     {
-        if ( ! is_resource($source) || get_resource_type($source) != "stream") {
+        if (! is_resource($source) || get_resource_type($source) != "stream") {
             throw InvalidArgumentException::invalidType('$source', $source, 'resource');
         }
 
@@ -580,10 +603,10 @@ class Bucket
      */
     private function createPathForFile(stdClass $file)
     {
-        if ( ! is_object($file->_id) || method_exists($file->_id, '__toString')) {
+        if (! is_object($file->_id) || method_exists($file->_id, '__toString')) {
             $id = (string) $file->_id;
         } else {
-            $id = \MongoDB\BSON\toJSON(\MongoDB\BSON\fromPHP(['_id' => $file->_id]));
+            $id = toJSON(fromPHP(['_id' => $file->_id]));
         }
 
         return sprintf(
@@ -632,13 +655,13 @@ class Bucket
      */
     private function getRawFileDocumentForStream($stream)
     {
-        if ( ! is_resource($stream) || get_resource_type($stream) != "stream") {
+        if (! is_resource($stream) || get_resource_type($stream) != "stream") {
             throw InvalidArgumentException::invalidType('$stream', $stream, 'resource');
         }
 
         $metadata = stream_get_meta_data($stream);
 
-        if ( ! isset ($metadata['wrapper_data']) || ! $metadata['wrapper_data'] instanceof StreamWrapper) {
+        if (! isset($metadata['wrapper_data']) || ! $metadata['wrapper_data'] instanceof StreamWrapper) {
             throw InvalidArgumentException::invalidType('$stream wrapper data', isset($metadata['wrapper_data']) ? $metadata['wrapper_data'] : null, StreamWrapper::class);
         }
 

src/GridFS/CollectionWrapper.php

@@ -18,12 +18,14 @@
 namespace MongoDB\GridFS;
 
 use MongoDB\Collection;
-use MongoDB\Exception\InvalidArgumentException;
-use MongoDB\UpdateResult;
 use MongoDB\Driver\Cursor;
 use MongoDB\Driver\Manager;
 use MongoDB\Driver\ReadPreference;
+use MongoDB\Exception\InvalidArgumentException;
+use MongoDB\UpdateResult;
 use stdClass;
+use function abs;
+use function sprintf;
 
 /**
  * CollectionWrapper abstracts the GridFS files and chunks collections.
@@ -122,7 +124,7 @@ class CollectionWrapper
      *
      * @see Bucket::downloadToStreamByName()
      * @see Bucket::openDownloadStreamByName()
-     * @param string $filename
+     * @param string  $filename
      * @param integer $revision
      * @return stdClass|null
      */
@@ -235,7 +237,7 @@ class CollectionWrapper
      */
     public function insertChunk($chunk)
     {
-        if ( ! $this->checkedIndexes) {
+        if (! $this->checkedIndexes) {
             $this->ensureIndexes();
         }
 
@@ -251,7 +253,7 @@ class CollectionWrapper
      */
     public function insertFile($file)
     {
-        if ( ! $this->checkedIndexes) {
+        if (! $this->checkedIndexes) {
             $this->ensureIndexes();
         }
 
@@ -262,7 +264,7 @@ class CollectionWrapper
      * Updates the filename field in the file document for a given ID.
      *
      * @param mixed  $id
-     * @param string $filename 
+     * @param string $filename
      * @return UpdateResult
      */
     public function updateFilenameForId($id, $filename)
@@ -315,7 +317,7 @@ class CollectionWrapper
 
         $this->checkedIndexes = true;
 
-        if ( ! $this->isFilesCollectionEmpty()) {
+        if (! $this->isFilesCollectionEmpty()) {
             return;
         }
 

src/GridFS/Exception/CorruptFileException.php

@@ -18,6 +18,7 @@
 namespace MongoDB\GridFS\Exception;
 
 use MongoDB\Exception\RuntimeException;
+use function sprintf;
 
 class CorruptFileException extends RuntimeException
 {

src/GridFS/Exception/FileNotFoundException.php

@@ -18,6 +18,9 @@
 namespace MongoDB\GridFS\Exception;
 
 use MongoDB\Exception\RuntimeException;
+use function MongoDB\BSON\fromPHP;
+use function MongoDB\BSON\toJSON;
+use function sprintf;
 
 class FileNotFoundException extends RuntimeException
 {
@@ -43,7 +46,7 @@ class FileNotFoundException extends RuntimeException
      */
     public static function byId($id, $namespace)
     {
-        $json = \MongoDB\BSON\toJSON(\MongoDB\BSON\fromPHP(['_id' => $id]));
+        $json = toJSON(fromPHP(['_id' => $id]));
 
         return new static(sprintf('File "%s" not found in "%s"', $json, $namespace));
     }

src/GridFS/ReadableStream.php

@@ -17,10 +17,17 @@
 
 namespace MongoDB\GridFS;
 
+use IteratorIterator;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\GridFS\Exception\CorruptFileException;
-use IteratorIterator;
 use stdClass;
+use function ceil;
+use function floor;
+use function is_integer;
+use function property_exists;
+use function sprintf;
+use function strlen;
+use function substr;
 
 /**
  * ReadableStream abstracts the process of reading a GridFS file.
@@ -49,15 +56,15 @@ class ReadableStream
      */
     public function __construct(CollectionWrapper $collectionWrapper, stdClass $file)
     {
-        if ( ! isset($file->chunkSize) || ! is_integer($file->chunkSize) || $file->chunkSize < 1) {
+        if (! isset($file->chunkSize) || ! is_integer($file->chunkSize) || $file->chunkSize < 1) {
             throw new CorruptFileException('file.chunkSize is not an integer >= 1');
         }
 
-        if ( ! isset($file->length) || ! is_integer($file->length) || $file->length < 0) {
+        if (! isset($file->length) || ! is_integer($file->length) || $file->length < 0) {
             throw new CorruptFileException('file.length is not an integer > 0');
         }
 
-        if ( ! isset($file->_id) && ! property_exists($file, '_id')) {
+        if (! isset($file->_id) && ! property_exists($file, '_id')) {
             throw new CorruptFileException('file._id does not exist');
         }
 
@@ -202,6 +209,7 @@ class ReadableStream
          */
         if ($lastChunkOffset > $this->chunkOffset) {
             $this->chunksIterator = null;
+
             return;
         }
 
@@ -239,7 +247,7 @@ class ReadableStream
             return false;
         }
 
-        if ( ! $this->chunksIterator->valid()) {
+        if (! $this->chunksIterator->valid()) {
             throw CorruptFileException::missingChunk($this->chunkOffset);
         }
 
@@ -253,7 +261,7 @@ class ReadableStream
 
         $actualChunkSize = strlen($this->buffer);
 
-        $expectedChunkSize = ($this->chunkOffset === $this->numChunks - 1)
+        $expectedChunkSize = $this->chunkOffset === $this->numChunks - 1
             ? $this->expectedLastChunkSize
             : $this->chunkSize;
 

src/GridFS/StreamWrapper.php

@@ -17,9 +17,24 @@
 
 namespace MongoDB\GridFS;
 
-use MongoDB\BSON\UTCDateTime;
 use Exception;
+use MongoDB\BSON\UTCDateTime;
 use stdClass;
+use function explode;
+use function get_class;
+use function in_array;
+use function is_integer;
+use function sprintf;
+use function stream_context_get_options;
+use function stream_get_wrappers;
+use function stream_wrapper_register;
+use function stream_wrapper_unregister;
+use function trigger_error;
+use const E_USER_WARNING;
+use const SEEK_CUR;
+use const SEEK_END;
+use const SEEK_SET;
+use const STREAM_IS_URL;
 
 /**
  * Stream wrapper for reading and writing a GridFS file.
@@ -60,7 +75,7 @@ class StreamWrapper
             stream_wrapper_unregister($protocol);
         }
 
-        stream_wrapper_register($protocol, get_called_class(), \STREAM_IS_URL);
+        stream_wrapper_register($protocol, static::class, STREAM_IS_URL);
     }
 
     /**
@@ -81,7 +96,7 @@ class StreamWrapper
      */
     public function stream_eof()
     {
-        if ( ! $this->stream instanceof ReadableStream) {
+        if (! $this->stream instanceof ReadableStream) {
             return false;
         }
 
@@ -126,14 +141,15 @@ class StreamWrapper
      */
     public function stream_read($length)
     {
-        if ( ! $this->stream instanceof ReadableStream) {
+        if (! $this->stream instanceof ReadableStream) {
             return '';
         }
 
         try {
             return $this->stream->readBytes($length);
         } catch (Exception $e) {
-            trigger_error(sprintf('%s: %s', get_class($e), $e->getMessage()), \E_USER_WARNING);
+            trigger_error(sprintf('%s: %s', get_class($e), $e->getMessage()), E_USER_WARNING);
+
             return false;
         }
     }
@@ -146,15 +162,15 @@ class StreamWrapper
      * @param integer $whence One of SEEK_SET, SEEK_CUR, or SEEK_END
      * @return boolean True if the position was updated and false otherwise
      */
-    public function stream_seek($offset, $whence = \SEEK_SET)
+    public function stream_seek($offset, $whence = SEEK_SET)
     {
         $size = $this->stream->getSize();
 
-        if ($whence === \SEEK_CUR) {
+        if ($whence === SEEK_CUR) {
             $offset += $this->stream->tell();
         }
 
-        if ($whence === \SEEK_END) {
+        if ($whence === SEEK_END) {
             $offset += $size;
         }
 
@@ -222,14 +238,15 @@ class StreamWrapper
      */
     public function stream_write($data)
     {
-        if ( ! $this->stream instanceof WritableStream) {
+        if (! $this->stream instanceof WritableStream) {
             return 0;
         }
 
         try {
             return $this->stream->writeBytes($data);
         } catch (Exception $e) {
-            trigger_error(sprintf('%s: %s', get_class($e), $e->getMessage()), \E_USER_WARNING);
+            trigger_error(sprintf('%s: %s', get_class($e), $e->getMessage()), E_USER_WARNING);
+
             return false;
         }
     }

src/GridFS/WritableStream.php

@@ -23,6 +23,19 @@ use MongoDB\BSON\UTCDateTime;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use stdClass;
+use function array_intersect_key;
+use function hash_final;
+use function hash_init;
+use function hash_update;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\is_string_array;
+use function sprintf;
+use function strlen;
+use function substr;
 
 /**
  * WritableStream abstracts the process of writing a GridFS file.
@@ -74,12 +87,12 @@ class WritableStream
     public function __construct(CollectionWrapper $collectionWrapper, $filename, array $options = [])
     {
         $options += [
-            '_id' => new ObjectId,
+            '_id' => new ObjectId(),
             'chunkSizeBytes' => self::$defaultChunkSizeBytes,
             'disableMD5' => false,
         ];
 
-        if (isset($options['aliases']) && ! \MongoDB\is_string_array($options['aliases'])) {
+        if (isset($options['aliases']) && ! is_string_array($options['aliases'])) {
             throw InvalidArgumentException::invalidType('"aliases" option', $options['aliases'], 'array of strings');
         }
 
@@ -107,7 +120,7 @@ class WritableStream
         $this->collectionWrapper = $collectionWrapper;
         $this->disableMD5 = $options['disableMD5'];
 
-        if ( ! $this->disableMD5) {
+        if (! $this->disableMD5) {
             $this->hashCtx = hash_init('md5');
         }
 
@@ -233,9 +246,9 @@ class WritableStream
     private function fileCollectionInsert()
     {
         $this->file['length'] = $this->length;
-        $this->file['uploadDate'] = new UTCDateTime;
+        $this->file['uploadDate'] = new UTCDateTime();
 
-        if ( ! $this->disableMD5) {
+        if (! $this->disableMD5) {
             $this->file['md5'] = hash_final($this->hashCtx);
         }
 
@@ -265,7 +278,7 @@ class WritableStream
             'data' => new Binary($data, Binary::TYPE_GENERIC),
         ];
 
-        if ( ! $this->disableMD5) {
+        if (! $this->disableMD5) {
             hash_update($this->hashCtx, $data);
         }
 

src/InsertManyResult.php

@@ -30,8 +30,6 @@ class InsertManyResult
     private $isAcknowledged;
 
     /**
-     * Constructor.
-     *
      * @param WriteResult $writeResult
      * @param mixed[]     $insertedIds
      */

src/InsertOneResult.php

@@ -30,8 +30,6 @@ class InsertOneResult
     private $isAcknowledged;
 
     /**
-     * Constructor.
-     *
      * @param WriteResult $writeResult
      * @param mixed       $insertedId
      */

src/MapReduceResult.php

@@ -20,6 +20,7 @@ namespace MongoDB;
 use IteratorAggregate;
 use stdClass;
 use Traversable;
+use function call_user_func;
 
 /**
  * Result class for mapReduce command results.
@@ -40,8 +41,6 @@ class MapReduceResult implements IteratorAggregate
     private $timing;
 
     /**
-     * Constructor.
-     *
      * @internal
      * @param callable $getIterator Callback that returns a Traversable for mapReduce results
      * @param stdClass $result      Result document from the mapReduce command

src/Model/BSONArray.php

@@ -17,10 +17,12 @@
 
 namespace MongoDB\Model;
 
-use MongoDB\BSON\Serializable;
-use MongoDB\BSON\Unserializable;
 use ArrayObject;
 use JsonSerializable;
+use MongoDB\BSON\Serializable;
+use MongoDB\BSON\Unserializable;
+use function array_values;
+use function MongoDB\recursive_copy;
 
 /**
  * Model class for a BSON array.
@@ -38,7 +40,7 @@ class BSONArray extends ArrayObject implements JsonSerializable, Serializable, U
     public function __clone()
     {
         foreach ($this as $key => $value) {
-            $this[$key] = \MongoDB\recursive_copy($value);
+            $this[$key] = recursive_copy($value);
         }
     }
 
@@ -52,7 +54,7 @@ class BSONArray extends ArrayObject implements JsonSerializable, Serializable, U
      */
     public static function __set_state(array $properties)
     {
-        $array = new static;
+        $array = new static();
         $array->exchangeArray($properties);
 
         return $array;

src/Model/BSONDocument.php

@@ -17,10 +17,11 @@
 
 namespace MongoDB\Model;
 
-use MongoDB\BSON\Serializable;
-use MongoDB\BSON\Unserializable;
 use ArrayObject;
 use JsonSerializable;
+use MongoDB\BSON\Serializable;
+use MongoDB\BSON\Unserializable;
+use function MongoDB\recursive_copy;
 
 /**
  * Model class for a BSON document.
@@ -38,13 +39,11 @@ class BSONDocument extends ArrayObject implements JsonSerializable, Serializable
     public function __clone()
     {
         foreach ($this as $key => $value) {
-            $this[$key] = \MongoDB\recursive_copy($value);
+            $this[$key] = recursive_copy($value);
         }
     }
 
     /**
-     * Constructor.
-     *
      * This overrides the parent constructor to allow property access of entries
      * by default.
      *
@@ -68,7 +67,7 @@ class BSONDocument extends ArrayObject implements JsonSerializable, Serializable
      */
     public static function __set_state(array $properties)
     {
-        $document = new static;
+        $document = new static();
         $document->exchangeArray($properties);
 
         return $document;

src/Model/BSONIterator.php

@@ -17,10 +17,15 @@
 
 namespace MongoDB\Model;
 
+use Iterator;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
-use MongoDB\Model\BSONDocument;
-use Iterator;
+use function is_array;
+use function MongoDB\BSON\toPHP;
+use function sprintf;
+use function strlen;
+use function substr;
+use function unpack;
 
 /**
  * Iterator for BSON documents.
@@ -55,7 +60,7 @@ class BSONIterator implements Iterator
             throw InvalidArgumentException::invalidType('"typeMap" option', $options['typeMap'], 'array');
         }
 
-        if ( ! isset($options['typeMap'])) {
+        if (! isset($options['typeMap'])) {
             $options['typeMap'] = [];
         }
 
@@ -130,7 +135,7 @@ class BSONIterator implements Iterator
             throw new UnexpectedValueException(sprintf('Expected %d bytes; %d remaining', $documentLength, $this->bufferLength - $this->position));
         }
 
-        $this->current = \MongoDB\BSON\toPHP(substr($this->buffer, $this->position, $documentLength), $this->options['typeMap']);
+        $this->current = toPHP(substr($this->buffer, $this->position, $documentLength), $this->options['typeMap']);
         $this->position += $documentLength;
     }
 }

src/Model/CachingIterator.php

@@ -21,6 +21,11 @@ use Countable;
 use Generator;
 use Iterator;
 use Traversable;
+use function count;
+use function current;
+use function key;
+use function next;
+use function reset;
 
 /**
  * Iterator for wrapping a Traversable and caching its results.
@@ -39,8 +44,6 @@ class CachingIterator implements Countable, Iterator
     private $iteratorExhausted = false;
 
     /**
-     * Constructor.
-     *
      * Initialize the iterator and stores the first item in the cache. This
      * effectively rewinds the Traversable and the wrapping Generator, which
      * will execute up to its first yield statement. Additionally, this mimics
@@ -90,7 +93,7 @@ class CachingIterator implements Countable, Iterator
      */
     public function next()
     {
-        if ( ! $this->iteratorExhausted) {
+        if (! $this->iteratorExhausted) {
             $this->iterator->next();
             $this->storeCurrentItem();
         }
@@ -128,7 +131,7 @@ class CachingIterator implements Countable, Iterator
      */
     private function exhaustIterator()
     {
-        while ( ! $this->iteratorExhausted) {
+        while (! $this->iteratorExhausted) {
             $this->next();
         }
     }

src/Model/ChangeStreamIterator.php

@@ -17,16 +17,22 @@
 
 namespace MongoDB\Model;
 
+use IteratorIterator;
 use MongoDB\BSON\Serializable;
 use MongoDB\Driver\Cursor;
 use MongoDB\Driver\Monitoring\CommandFailedEvent;
-use MongoDB\Driver\Monitoring\CommandSubscriber;
 use MongoDB\Driver\Monitoring\CommandStartedEvent;
+use MongoDB\Driver\Monitoring\CommandSubscriber;
 use MongoDB\Driver\Monitoring\CommandSucceededEvent;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\ResumeTokenException;
 use MongoDB\Exception\UnexpectedValueException;
-use IteratorIterator;
+use function count;
+use function is_array;
+use function is_integer;
+use function is_object;
+use function MongoDB\Driver\Monitoring\addSubscriber;
+use function MongoDB\Driver\Monitoring\removeSubscriber;
 
 /**
  * ChangeStreamIterator wraps a change stream's tailable cursor.
@@ -46,8 +52,6 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
     private $resumeToken;
 
     /**
-     * Constructor.
-     *
      * @internal
      * @param Cursor            $cursor
      * @param integer           $firstBatchSize
@@ -56,7 +60,7 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
      */
     public function __construct(Cursor $cursor, $firstBatchSize, $initialResumeToken, $postBatchResumeToken)
     {
-        if ( ! is_integer($firstBatchSize)) {
+        if (! is_integer($firstBatchSize)) {
             throw InvalidArgumentException::invalidType('$firstBatchSize', $firstBatchSize, 'integer');
         }
 
@@ -102,7 +106,7 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
 
         $reply = $event->getReply();
 
-        if ( ! isset($reply->cursor->nextBatch) || ! is_array($reply->cursor->nextBatch)) {
+        if (! isset($reply->cursor->nextBatch) || ! is_array($reply->cursor->nextBatch)) {
             throw new UnexpectedValueException('getMore command did not return a "cursor.nextBatch" array');
         }
 
@@ -141,15 +145,15 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
         $getMore = $this->isAtEndOfBatch();
 
         if ($getMore) {
-            \MongoDB\Driver\Monitoring\addSubscriber($this);
+            addSubscriber($this);
         }
 
         try {
             parent::next();
-            $this->onIteration(!$getMore);
+            $this->onIteration(! $getMore);
         } finally {
             if ($getMore) {
-                \MongoDB\Driver\Monitoring\removeSubscriber($this);
+                removeSubscriber($this);
             }
         }
     }
@@ -178,7 +182,7 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
      */
     private function extractResumeToken($document)
     {
-        if ( ! is_array($document) && ! is_object($document)) {
+        if (! is_array($document) && ! is_object($document)) {
             throw InvalidArgumentException::invalidType('$document', $document, 'array or object');
         }
 
@@ -190,11 +194,11 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
             ? (isset($document['_id']) ? $document['_id'] : null)
             : (isset($document->_id) ? $document->_id : null);
 
-        if ( ! isset($resumeToken)) {
+        if (! isset($resumeToken)) {
             throw ResumeTokenException::notFound();
         }
 
-        if ( ! is_array($resumeToken) && ! is_object($resumeToken)) {
+        if (! is_array($resumeToken) && ! is_object($resumeToken)) {
             throw ResumeTokenException::invalidType($resumeToken);
         }
 
@@ -208,7 +212,7 @@ class ChangeStreamIterator extends IteratorIterator implements CommandSubscriber
      */
     private function isAtEndOfBatch()
     {
-        return ($this->batchPosition + 1 >= $this->batchSize);
+        return $this->batchPosition + 1 >= $this->batchSize;
     }
 
     /**

src/Model/CollectionInfo.php

@@ -17,8 +17,9 @@
 
 namespace MongoDB\Model;
 
-use MongoDB\Exception\BadMethodCallException;
 use ArrayAccess;
+use MongoDB\Exception\BadMethodCallException;
+use function array_key_exists;
 
 /**
  * Collection information model class.
@@ -36,8 +37,6 @@ class CollectionInfo implements ArrayAccess
     private $info;
 
     /**
-     * Constructor.
-     *
      * @param array $info Collection info
      */
     public function __construct(array $info)
@@ -142,7 +141,7 @@ class CollectionInfo implements ArrayAccess
      */
     public function offsetSet($key, $value)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 
     /**
@@ -154,6 +153,6 @@ class CollectionInfo implements ArrayAccess
      */
     public function offsetUnset($key)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 }

src/Model/DatabaseInfo.php

@@ -17,8 +17,10 @@
 
 namespace MongoDB\Model;
 
-use MongoDB\Exception\BadMethodCallException;
 use ArrayAccess;
+use MongoDB\Exception\BadMethodCallException;
+use function array_key_exists;
+
 /**
  * Database information model class.
  *
@@ -34,8 +36,6 @@ class DatabaseInfo implements ArrayAccess
     private $info;
 
     /**
-     * Constructor.
-     *
      * @param array $info Database info
      */
     public function __construct(array $info)
@@ -119,7 +119,7 @@ class DatabaseInfo implements ArrayAccess
      */
     public function offsetSet($key, $value)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 
     /**
@@ -131,6 +131,6 @@ class DatabaseInfo implements ArrayAccess
      */
     public function offsetUnset($key)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 }

src/Model/DatabaseInfoLegacyIterator.php

@@ -17,6 +17,11 @@
 
 namespace MongoDB\Model;
 
+use function current;
+use function key;
+use function next;
+use function reset;
+
 /**
  * DatabaseInfoIterator for inline listDatabases command results.
  *
@@ -32,8 +37,6 @@ class DatabaseInfoLegacyIterator implements DatabaseInfoIterator
     private $databases;
 
     /**
-     * Constructor.
-     *
      * @param array $databases
      */
     public function __construct(array $databases)

src/Model/IndexInfo.php

@@ -17,8 +17,10 @@
 
 namespace MongoDB\Model;
 
-use MongoDB\Exception\BadMethodCallException;
 use ArrayAccess;
+use MongoDB\Exception\BadMethodCallException;
+use function array_key_exists;
+use function array_search;
 
 /**
  * Index information model class.
@@ -40,8 +42,6 @@ class IndexInfo implements ArrayAccess
     private $info;
 
     /**
-     * Constructor.
-     *
      * @param array $info Index info
      */
     public function __construct(array $info)
@@ -212,7 +212,7 @@ class IndexInfo implements ArrayAccess
      */
     public function offsetSet($key, $value)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 
     /**
@@ -224,6 +224,6 @@ class IndexInfo implements ArrayAccess
      */
     public function offsetUnset($key)
     {
-        throw BadMethodCallException::classIsImmutable(__CLASS__);
+        throw BadMethodCallException::classIsImmutable(self::class);
     }
 }

src/Model/IndexInput.php

@@ -19,6 +19,13 @@ namespace MongoDB\Model;
 
 use MongoDB\BSON\Serializable;
 use MongoDB\Exception\InvalidArgumentException;
+use function is_array;
+use function is_float;
+use function is_int;
+use function is_object;
+use function is_string;
+use function MongoDB\generate_index_name;
+use function sprintf;
 
 /**
  * Index input model class.
@@ -35,40 +42,38 @@ class IndexInput implements Serializable
     private $index;
 
     /**
-     * Constructor.
-     *
      * @param array $index Index specification
      * @throws InvalidArgumentException
      */
     public function __construct(array $index)
     {
-        if ( ! isset($index['key'])) {
+        if (! isset($index['key'])) {
             throw new InvalidArgumentException('Required "key" document is missing from index specification');
         }
 
-        if ( ! is_array($index['key']) && ! is_object($index['key'])) {
+        if (! is_array($index['key']) && ! is_object($index['key'])) {
             throw InvalidArgumentException::invalidType('"key" option', $index['key'], 'array or object');
         }
 
         foreach ($index['key'] as $fieldName => $order) {
-            if ( ! is_int($order) && ! is_float($order) && ! is_string($order)) {
+            if (! is_int($order) && ! is_float($order) && ! is_string($order)) {
                 throw InvalidArgumentException::invalidType(sprintf('order value for "%s" field within "key" option', $fieldName), $order, 'numeric or string');
             }
         }
 
-        if ( ! isset($index['ns'])) {
+        if (! isset($index['ns'])) {
             throw new InvalidArgumentException('Required "ns" option is missing from index specification');
         }
 
-        if ( ! is_string($index['ns'])) {
+        if (! is_string($index['ns'])) {
             throw InvalidArgumentException::invalidType('"ns" option', $index['ns'], 'string');
         }
 
-        if ( ! isset($index['name'])) {
-            $index['name'] = \MongoDB\generate_index_name($index['key']);
+        if (! isset($index['name'])) {
+            $index['name'] = generate_index_name($index['key']);
         }
 
-        if ( ! is_string($index['name'])) {
+        if (! is_string($index['name'])) {
             throw InvalidArgumentException::invalidType('"name" option', $index['name'], 'string');
         }
 

src/Operation/Aggregate.php

@@ -17,19 +17,29 @@
 
 namespace MongoDB\Operation;
 
+use ArrayIterator;
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
-use ArrayIterator;
 use stdClass;
 use Traversable;
+use function current;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\create_field_path_type_map;
+use function MongoDB\is_last_pipeline_operator_write;
+use function MongoDB\server_supports_feature;
+use function sprintf;
 
 /**
  * Operation for the aggregate command.
@@ -132,7 +142,7 @@ class Aggregate implements Executable
                 throw new InvalidArgumentException(sprintf('$pipeline is not a list (unexpected index: "%s")', $i));
             }
 
-            if ( ! is_array($operation) && ! is_object($operation)) {
+            if (! is_array($operation) && ! is_object($operation)) {
                 throw InvalidArgumentException::invalidType(sprintf('$pipeline[%d]', $i), $operation, 'array or object');
             }
 
@@ -144,7 +154,7 @@ class Aggregate implements Executable
             'useCursor' => true,
         ];
 
-        if ( ! is_bool($options['allowDiskUse'])) {
+        if (! is_bool($options['allowDiskUse'])) {
             throw InvalidArgumentException::invalidType('"allowDiskUse" option', $options['allowDiskUse'], 'boolean');
         }
 
@@ -196,7 +206,7 @@ class Aggregate implements Executable
             throw InvalidArgumentException::invalidType('"typeMap" option', $options['typeMap'], 'array');
         }
 
-        if ( ! is_bool($options['useCursor'])) {
+        if (! is_bool($options['useCursor'])) {
             throw InvalidArgumentException::invalidType('"useCursor" option', $options['useCursor'], 'boolean');
         }
 
@@ -216,7 +226,7 @@ class Aggregate implements Executable
             unset($options['writeConcern']);
         }
 
-        if ( ! empty($options['explain'])) {
+        if (! empty($options['explain'])) {
             $options['useCursor'] = false;
         }
 
@@ -238,15 +248,15 @@ class Aggregate implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['readConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
             throw UnsupportedException::readConcernNotSupported();
         }
 
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 
@@ -260,14 +270,13 @@ class Aggregate implements Executable
             }
         }
 
-
         $hasExplain = ! empty($this->options['explain']);
-        $hasWriteStage = \MongoDB\is_last_pipeline_operator_write($this->pipeline);
+        $hasWriteStage = is_last_pipeline_operator_write($this->pipeline);
 
         $command = $this->createCommand($server, $hasWriteStage);
         $options = $this->createOptions($hasWriteStage, $hasExplain);
 
-        $cursor = ($hasWriteStage && ! $hasExplain)
+        $cursor = $hasWriteStage && ! $hasExplain
             ? $server->executeReadWriteCommand($this->databaseName, $command, $options)
             : $server->executeReadCommand($this->databaseName, $command, $options);
 
@@ -280,12 +289,12 @@ class Aggregate implements Executable
         }
 
         if (isset($this->options['typeMap'])) {
-            $cursor->setTypeMap(\MongoDB\create_field_path_type_map($this->options['typeMap'], 'result.$'));
+            $cursor->setTypeMap(create_field_path_type_map($this->options['typeMap'], 'result.$'));
         }
 
         $result = current($cursor->toArray());
 
-        if ( ! isset($result->result) || ! is_array($result->result)) {
+        if (! isset($result->result) || ! is_array($result->result)) {
             throw new UnexpectedValueException('aggregate command did not return a "result" array');
         }
 
@@ -309,9 +318,8 @@ class Aggregate implements Executable
 
         $cmd['allowDiskUse'] = $this->options['allowDiskUse'];
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }
@@ -338,9 +346,9 @@ class Aggregate implements Executable
             /* Ignore batchSize if pipeline includes an $out or $merge stage, as
              * no documents will be returned and sending a batchSize of zero
              * could prevent the pipeline from executing at all. */
-            $cmd['cursor'] = isset($this->options["batchSize"]) && !$hasWriteStage
+            $cmd['cursor'] = isset($this->options["batchSize"]) && ! $hasWriteStage
                 ? ['batchSize' => $this->options["batchSize"]]
-                : new stdClass;
+                : new stdClass();
         }
 
         return new Command($cmd, $cmdOptions);
@@ -363,7 +371,7 @@ class Aggregate implements Executable
             $options['readConcern'] = $this->options['readConcern'];
         }
 
-        if (!$hasWriteStage && isset($this->options['readPreference'])) {
+        if (! $hasWriteStage && isset($this->options['readPreference'])) {
             $options['readPreference'] = $this->options['readPreference'];
         }
 

src/Operation/BulkWrite.php

@@ -19,12 +19,22 @@ namespace MongoDB\Operation;
 
 use MongoDB\BulkWriteResult;
 use MongoDB\Driver\BulkWrite as Bulk;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function array_key_exists;
+use function count;
+use function current;
+use function is_array;
+use function is_bool;
+use function is_object;
+use function key;
+use function MongoDB\is_first_key_operator;
+use function MongoDB\server_supports_feature;
+use function sprintf;
 
 /**
  * Operation for executing multiple write operations.
@@ -132,7 +142,7 @@ class BulkWrite implements Executable
                 throw new InvalidArgumentException(sprintf('$operations is not a list (unexpected index: "%s")', $i));
             }
 
-            if ( ! is_array($operation)) {
+            if (! is_array($operation)) {
                 throw InvalidArgumentException::invalidType(sprintf('$operations[%d]', $i), $operation, 'array');
             }
 
@@ -143,11 +153,11 @@ class BulkWrite implements Executable
             $type = key($operation);
             $args = current($operation);
 
-            if ( ! isset($args[0]) && ! array_key_exists(0, $args)) {
+            if (! isset($args[0]) && ! array_key_exists(0, $args)) {
                 throw new InvalidArgumentException(sprintf('Missing first argument for $operations[%d]["%s"]', $i, $type));
             }
 
-            if ( ! is_array($args[0]) && ! is_object($args[0])) {
+            if (! is_array($args[0]) && ! is_object($args[0])) {
                 throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][0]', $i, $type), $args[0], 'array or object');
             }
 
@@ -157,11 +167,11 @@ class BulkWrite implements Executable
 
                 case self::DELETE_MANY:
                 case self::DELETE_ONE:
-                    if ( ! isset($args[1])) {
+                    if (! isset($args[1])) {
                         $args[1] = [];
                     }
 
-                    if ( ! is_array($args[1])) {
+                    if (! is_array($args[1])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][1]', $i, $type), $args[1], 'array');
                     }
 
@@ -170,7 +180,7 @@ class BulkWrite implements Executable
                     if (isset($args[1]['collation'])) {
                         $this->isCollationUsed = true;
 
-                        if ( ! is_array($args[1]['collation']) && ! is_object($args[1]['collation'])) {
+                        if (! is_array($args[1]['collation']) && ! is_object($args[1]['collation'])) {
                             throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][1]["collation"]', $i, $type), $args[1]['collation'], 'array or object');
                         }
                     }
@@ -180,23 +190,23 @@ class BulkWrite implements Executable
                     break;
 
                 case self::REPLACE_ONE:
-                    if ( ! isset($args[1]) && ! array_key_exists(1, $args)) {
+                    if (! isset($args[1]) && ! array_key_exists(1, $args)) {
                         throw new InvalidArgumentException(sprintf('Missing second argument for $operations[%d]["%s"]', $i, $type));
                     }
 
-                    if ( ! is_array($args[1]) && ! is_object($args[1])) {
+                    if (! is_array($args[1]) && ! is_object($args[1])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][1]', $i, $type), $args[1], 'array or object');
                     }
 
-                    if (\MongoDB\is_first_key_operator($args[1])) {
+                    if (is_first_key_operator($args[1])) {
                         throw new InvalidArgumentException(sprintf('First key in $operations[%d]["%s"][1] is an update operator', $i, $type));
                     }
 
-                    if ( ! isset($args[2])) {
+                    if (! isset($args[2])) {
                         $args[2] = [];
                     }
 
-                    if ( ! is_array($args[2])) {
+                    if (! is_array($args[2])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]', $i, $type), $args[2], 'array');
                     }
 
@@ -206,12 +216,12 @@ class BulkWrite implements Executable
                     if (isset($args[2]['collation'])) {
                         $this->isCollationUsed = true;
 
-                        if ( ! is_array($args[2]['collation']) && ! is_object($args[2]['collation'])) {
+                        if (! is_array($args[2]['collation']) && ! is_object($args[2]['collation'])) {
                             throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]["collation"]', $i, $type), $args[2]['collation'], 'array or object');
                         }
                     }
 
-                    if ( ! is_bool($args[2]['upsert'])) {
+                    if (! is_bool($args[2]['upsert'])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]["upsert"]', $i, $type), $args[2]['upsert'], 'boolean');
                     }
 
@@ -221,23 +231,23 @@ class BulkWrite implements Executable
 
                 case self::UPDATE_MANY:
                 case self::UPDATE_ONE:
-                    if ( ! isset($args[1]) && ! array_key_exists(1, $args)) {
+                    if (! isset($args[1]) && ! array_key_exists(1, $args)) {
                         throw new InvalidArgumentException(sprintf('Missing second argument for $operations[%d]["%s"]', $i, $type));
                     }
 
-                    if ( ! is_array($args[1]) && ! is_object($args[1])) {
+                    if (! is_array($args[1]) && ! is_object($args[1])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][1]', $i, $type), $args[1], 'array or object');
                     }
 
-                    if ( ! \MongoDB\is_first_key_operator($args[1])) {
+                    if (! is_first_key_operator($args[1])) {
                         throw new InvalidArgumentException(sprintf('First key in $operations[%d]["%s"][1] is not an update operator', $i, $type));
                     }
 
-                    if ( ! isset($args[2])) {
+                    if (! isset($args[2])) {
                         $args[2] = [];
                     }
 
-                    if ( ! is_array($args[2])) {
+                    if (! is_array($args[2])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]', $i, $type), $args[2], 'array');
                     }
 
@@ -247,7 +257,7 @@ class BulkWrite implements Executable
                     if (isset($args[2]['arrayFilters'])) {
                         $this->isArrayFiltersUsed = true;
 
-                        if ( ! is_array($args[2]['arrayFilters'])) {
+                        if (! is_array($args[2]['arrayFilters'])) {
                             throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]["arrayFilters"]', $i, $type), $args[2]['arrayFilters'], 'array');
                         }
                     }
@@ -255,12 +265,12 @@ class BulkWrite implements Executable
                     if (isset($args[2]['collation'])) {
                         $this->isCollationUsed = true;
 
-                        if ( ! is_array($args[2]['collation']) && ! is_object($args[2]['collation'])) {
+                        if (! is_array($args[2]['collation']) && ! is_object($args[2]['collation'])) {
                             throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]["collation"]', $i, $type), $args[2]['collation'], 'array or object');
                         }
                     }
 
-                    if ( ! is_bool($args[2]['upsert'])) {
+                    if (! is_bool($args[2]['upsert'])) {
                         throw InvalidArgumentException::invalidType(sprintf('$operations[%d]["%s"][2]["upsert"]', $i, $type), $args[2]['upsert'], 'boolean');
                     }
 
@@ -281,7 +291,7 @@ class BulkWrite implements Executable
             throw InvalidArgumentException::invalidType('"bypassDocumentValidation" option', $options['bypassDocumentValidation'], 'boolean');
         }
 
-        if ( ! is_bool($options['ordered'])) {
+        if (! is_bool($options['ordered'])) {
             throw InvalidArgumentException::invalidType('"ordered" option', $options['ordered'], 'boolean');
         }
 
@@ -314,11 +324,11 @@ class BulkWrite implements Executable
      */
     public function execute(Server $server)
     {
-        if ($this->isArrayFiltersUsed && ! \MongoDB\server_supports_feature($server, self::$wireVersionForArrayFilters)) {
+        if ($this->isArrayFiltersUsed && ! server_supports_feature($server, self::$wireVersionForArrayFilters)) {
             throw UnsupportedException::arrayFiltersNotSupported();
         }
 
-        if ($this->isCollationUsed && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if ($this->isCollationUsed && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
@@ -329,9 +339,8 @@ class BulkWrite implements Executable
 
         $options = ['ordered' => $this->options['ordered']];
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $options['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }

src/Operation/Count.php

@@ -18,14 +18,21 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_float;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the count command.
@@ -85,7 +92,7 @@ class Count implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter = [], array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
@@ -143,11 +150,11 @@ class Count implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['readConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
             throw UnsupportedException::readConcernNotSupported();
         }
 
@@ -160,7 +167,7 @@ class Count implements Executable, Explainable
         $result = current($cursor->toArray());
 
         // Older server versions may return a float
-        if ( ! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
+        if (! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
             throw new UnexpectedValueException('count command did not return a numeric "n" value');
         }
 
@@ -181,7 +188,7 @@ class Count implements Executable, Explainable
     {
         $cmd = ['count' => $this->collectionName];
 
-        if ( ! empty($this->filter)) {
+        if (! empty($this->filter)) {
             $cmd['query'] = (object) $this->filter;
         }
 

src/Operation/CountDocuments.php

@@ -17,11 +17,18 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use function array_intersect_key;
+use function count;
+use function current;
+use function is_array;
+use function is_float;
+use function is_integer;
+use function is_object;
 
 /**
  * Operation for obtaining an exact count of documents in a collection
@@ -80,7 +87,7 @@ class CountDocuments implements Executable
      */
     public function __construct($databaseName, $collectionName, $filter, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
@@ -124,7 +131,7 @@ class CountDocuments implements Executable
         }
 
         $result = current($allResults);
-        if ( ! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
+        if (! isset($result->n) || ! (is_integer($result->n) || is_float($result->n))) {
             throw new UnexpectedValueException('count command did not return a numeric "n" value');
         }
 
@@ -137,7 +144,7 @@ class CountDocuments implements Executable
     private function createAggregate()
     {
         $pipeline = [
-            ['$match' => (object) $this->filter]
+            ['$match' => (object) $this->filter],
         ];
 
         if (isset($this->countOptions['skip'])) {

src/Operation/CreateCollection.php

@@ -18,12 +18,21 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\server_supports_feature;
+use function trigger_error;
+use const E_USER_DEPRECATED;
 
 /**
  * Operation for the create command.
@@ -194,11 +203,11 @@ class CreateCollection implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 

src/Operation/CreateIndexes.php

@@ -17,15 +17,19 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\BulkWrite as Bulk;
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\Model\IndexInput;
+use function array_map;
+use function is_array;
+use function is_integer;
+use function MongoDB\server_supports_feature;
+use function sprintf;
 
 /**
  * Operation for the createIndexes command.
@@ -82,11 +86,11 @@ class CreateIndexes implements Executable
                 throw new InvalidArgumentException(sprintf('$indexes is not a list (unexpected index: "%s")', $i));
             }
 
-            if ( ! is_array($index)) {
+            if (! is_array($index)) {
                 throw InvalidArgumentException::invalidType(sprintf('$index[%d]', $i), $index, 'array');
             }
 
-            if ( ! isset($index['ns'])) {
+            if (! isset($index['ns'])) {
                 $index['ns'] = $databaseName . '.' . $collectionName;
             }
 
@@ -99,7 +103,7 @@ class CreateIndexes implements Executable
             $expectedIndex += 1;
         }
 
-        if (isset($options['maxTimeMS']) && !is_integer($options['maxTimeMS'])) {
+        if (isset($options['maxTimeMS']) && ! is_integer($options['maxTimeMS'])) {
             throw InvalidArgumentException::invalidType('"maxTimeMS" option', $options['maxTimeMS'], 'integer');
         }
 
@@ -131,11 +135,11 @@ class CreateIndexes implements Executable
      */
     public function execute(Server $server)
     {
-        if ($this->isCollationUsed && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if ($this->isCollationUsed && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 
@@ -146,7 +150,9 @@ class CreateIndexes implements Executable
 
         $this->executeCommand($server);
 
-        return array_map(function(IndexInput $index) { return (string) $index; }, $this->indexes);
+        return array_map(function (IndexInput $index) {
+            return (string) $index;
+        }, $this->indexes);
     }
 
     /**

src/Operation/DatabaseCommand.php

@@ -23,6 +23,8 @@ use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Exception\InvalidArgumentException;
+use function is_array;
+use function is_object;
 
 /**
  * Operation for executing a database command.
@@ -54,14 +56,14 @@ class DatabaseCommand implements Executable
      *  * typeMap (array): Type map for BSON deserialization. This will be
      *    applied to the returned Cursor (it is not sent to the server).
      *
-     * @param string       $databaseName   Database name
-     * @param array|object $command        Command document
-     * @param array        $options        Options for command execution
+     * @param string       $databaseName Database name
+     * @param array|object $command      Command document
+     * @param array        $options      Options for command execution
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function __construct($databaseName, $command, array $options = [])
     {
-        if ( ! is_array($command) && ! is_object($command)) {
+        if (! is_array($command) && ! is_object($command)) {
             throw InvalidArgumentException::invalidType('$command', $command, 'array or object');
         }
 
@@ -78,7 +80,7 @@ class DatabaseCommand implements Executable
         }
 
         $this->databaseName = (string) $databaseName;
-        $this->command = ($command instanceof Command) ? $command : new Command($command);
+        $this->command = $command instanceof Command ? $command : new Command($command);
         $this->options = $options;
     }
 

src/Operation/Delete.php

@@ -19,12 +19,15 @@ namespace MongoDB\Operation;
 
 use MongoDB\DeleteResult;
 use MongoDB\Driver\BulkWrite as Bulk;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function is_array;
+use function is_object;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the delete command.
@@ -72,7 +75,7 @@ class Delete implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $limit, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
@@ -113,7 +116,7 @@ class Delete implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 

src/Operation/DeleteMany.php

@@ -18,8 +18,8 @@
 namespace MongoDB\Operation;
 
 use MongoDB\DeleteResult;
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
 

src/Operation/DeleteOne.php

@@ -18,8 +18,8 @@
 namespace MongoDB\Operation;
 
 use MongoDB\DeleteResult;
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
 

src/Operation/Distinct.php

@@ -18,14 +18,20 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_integer;
+use function is_object;
+use function MongoDB\create_field_path_type_map;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the distinct command.
@@ -80,7 +86,7 @@ class Distinct implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $fieldName, $filter = [], array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
@@ -131,11 +137,11 @@ class Distinct implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['readConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
             throw UnsupportedException::readConcernNotSupported();
         }
 
@@ -147,12 +153,12 @@ class Distinct implements Executable, Explainable
         $cursor = $server->executeReadCommand($this->databaseName, new Command($this->createCommandDocument()), $this->createOptions());
 
         if (isset($this->options['typeMap'])) {
-            $cursor->setTypeMap(\MongoDB\create_field_path_type_map($this->options['typeMap'], 'values.$'));
+            $cursor->setTypeMap(create_field_path_type_map($this->options['typeMap'], 'values.$'));
         }
 
         $result = current($cursor->toArray());
 
-        if ( ! isset($result->values) || ! is_array($result->values)) {
+        if (! isset($result->values) || ! is_array($result->values)) {
             throw new UnexpectedValueException('distinct command did not return a "values" array');
         }
 
@@ -176,7 +182,7 @@ class Distinct implements Executable, Explainable
             'key' => $this->fieldName,
         ];
 
-        if ( ! empty($this->filter)) {
+        if (! empty($this->filter)) {
             $cmd['query'] = (object) $this->filter;
         }
 

src/Operation/DropCollection.php

@@ -18,12 +18,15 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the drop command.
@@ -98,7 +101,7 @@ class DropCollection implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 

src/Operation/DropDatabase.php

@@ -18,12 +18,15 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the dropDatabase command.
@@ -94,7 +97,7 @@ class DropDatabase implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 

src/Operation/DropIndexes.php

@@ -18,12 +18,16 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_integer;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the dropIndexes command.
@@ -112,7 +116,7 @@ class DropIndexes implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 

src/Operation/EstimatedDocumentCount.php

@@ -17,11 +17,12 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use function array_intersect_key;
 
 /**
  * Operation for obtaining an estimated count of documents in a collection
@@ -56,9 +57,9 @@ class EstimatedDocumentCount implements Executable, Explainable
      *
      *    Sessions are not supported for server versions < 3.6.
      *
-     * @param string       $databaseName   Database name
-     * @param string       $collectionName Collection name
-     * @param array        $options        Command options
+     * @param string $databaseName   Database name
+     * @param string $collectionName Collection name
+     * @param array  $options        Command options
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function __construct($databaseName, $collectionName, array $options = [])

src/Operation/Explain.php

@@ -21,9 +21,12 @@ use MongoDB\Driver\Command;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Exception\UnsupportedException;
 use MongoDB\Exception\InvalidArgumentException;
-use MongoDB\Model\BSONDocument;
+use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_string;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the explain command.
@@ -59,9 +62,9 @@ class Explain implements Executable
      *
      *  * verbosity (string): The mode in which the explain command will be run.
      *
-     * @param string $databaseName      Database name
+     * @param string      $databaseName Database name
      * @param Explainable $explainable  Operation to explain
-     * @param array  $options           Command options
+     * @param array       $options      Command options
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function __construct($databaseName, Explainable $explainable, array $options = [])
@@ -89,11 +92,11 @@ class Explain implements Executable
 
     public function execute(Server $server)
     {
-        if ($this->explainable instanceof Distinct && ! \MongoDB\server_supports_feature($server, self::$wireVersionForDistinct)) {
+        if ($this->explainable instanceof Distinct && ! server_supports_feature($server, self::$wireVersionForDistinct)) {
             throw UnsupportedException::explainNotSupported();
         }
 
-        if ($this->isFindAndModify($this->explainable) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForFindAndModify)) {
+        if ($this->isFindAndModify($this->explainable) && ! server_supports_feature($server, self::$wireVersionForFindAndModify)) {
             throw UnsupportedException::explainNotSupported();
         }
 
@@ -138,6 +141,7 @@ class Explain implements Executable
         if ($explainable instanceof FindAndModify || $explainable instanceof FindOneAndDelete || $explainable instanceof FindOneAndReplace || $explainable instanceof FindOneAndUpdate) {
             return true;
         }
+
         return false;
     }
 }

src/Operation/Find.php

@@ -18,15 +18,23 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Cursor;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Query;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
-use MongoDB\Model\BSONDocument;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\server_supports_feature;
+use function trigger_error;
+use const E_USER_DEPRECATED;
+
 /**
  * Operation for the find command.
  *
@@ -147,7 +155,7 @@ class Find implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
@@ -168,7 +176,7 @@ class Find implements Executable, Explainable
         }
 
         if (isset($options['cursorType'])) {
-            if ( ! is_integer($options['cursorType'])) {
+            if (! is_integer($options['cursorType'])) {
                 throw InvalidArgumentException::invalidType('"cursorType" option', $options['cursorType'], 'integer');
             }
 
@@ -288,11 +296,11 @@ class Find implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['readConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
             throw UnsupportedException::readConcernNotSupported();
         }
 
@@ -346,7 +354,7 @@ class Find implements Executable, Explainable
         ];
 
         foreach ($modifierFallback as $modifier) {
-            if ( ! isset($options[$modifier[0]]) && isset($options['modifiers'][$modifier[1]])) {
+            if (! isset($options[$modifier[0]]) && isset($options['modifiers'][$modifier[1]])) {
                 $options[$modifier[0]] = $options['modifiers'][$modifier[1]];
             }
         }
@@ -412,7 +420,7 @@ class Find implements Executable, Explainable
 
         $modifiers = empty($this->options['modifiers']) ? [] : (array) $this->options['modifiers'];
 
-        if ( ! empty($modifiers)) {
+        if (! empty($modifiers)) {
             $options['modifiers'] = $modifiers;
         }
 

src/Operation/FindAndModify.php

@@ -18,13 +18,20 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function MongoDB\create_field_path_type_map;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the findAndModify command.
@@ -137,7 +144,7 @@ class FindAndModify implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"maxTimeMS" option', $options['maxTimeMS'], 'integer');
         }
 
-        if ( ! is_bool($options['new'])) {
+        if (! is_bool($options['new'])) {
             throw InvalidArgumentException::invalidType('"new" option', $options['new'], 'boolean');
         }
 
@@ -145,7 +152,7 @@ class FindAndModify implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"query" option', $options['query'], 'array or object');
         }
 
-        if ( ! is_bool($options['remove'])) {
+        if (! is_bool($options['remove'])) {
             throw InvalidArgumentException::invalidType('"remove" option', $options['remove'], 'boolean');
         }
 
@@ -169,11 +176,11 @@ class FindAndModify implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"writeConcern" option', $options['writeConcern'], WriteConcern::class);
         }
 
-        if ( ! is_bool($options['upsert'])) {
+        if (! is_bool($options['upsert'])) {
             throw InvalidArgumentException::invalidType('"upsert" option', $options['upsert'], 'boolean');
         }
 
-        if ( ! (isset($options['update']) xor $options['remove'])) {
+        if (! (isset($options['update']) xor $options['remove'])) {
             throw new InvalidArgumentException('The "remove" option must be true or an "update" document must be specified, but not both');
         }
 
@@ -198,15 +205,15 @@ class FindAndModify implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['arrayFilters']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForArrayFilters)) {
+        if (isset($this->options['arrayFilters']) && ! server_supports_feature($server, self::$wireVersionForArrayFilters)) {
             throw UnsupportedException::arrayFiltersNotSupported();
         }
 
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 
@@ -218,7 +225,7 @@ class FindAndModify implements Executable, Explainable
         $cursor = $server->executeWriteCommand($this->databaseName, new Command($this->createCommandDocument($server)), $this->createOptions());
 
         if (isset($this->options['typeMap'])) {
-            $cursor->setTypeMap(\MongoDB\create_field_path_type_map($this->options['typeMap'], 'value'));
+            $cursor->setTypeMap(create_field_path_type_map($this->options['typeMap'], 'value'));
         }
 
         $result = current($cursor->toArray());
@@ -262,9 +269,8 @@ class FindAndModify implements Executable, Explainable
             $cmd['maxTimeMS'] = $this->options['maxTimeMS'];
         }
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }

src/Operation/FindOne.php

@@ -17,10 +17,11 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
 
 /**
  * Operation for finding a single document with the find command.
@@ -126,7 +127,7 @@ class FindOne implements Executable, Explainable
         $cursor = $this->find->execute($server);
         $document = current($cursor->toArray());
 
-        return ($document === false) ? null : $document;
+        return $document === false ? null : $document;
     }
 
     public function getCommandDocument(Server $server)

src/Operation/FindOneAndDelete.php

@@ -17,10 +17,12 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function is_array;
+use function is_object;
 
 /**
  * Operation for deleting a document with the findAndModify command.
@@ -71,7 +73,7 @@ class FindOneAndDelete implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 

src/Operation/FindOneAndReplace.php

@@ -17,10 +17,14 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function is_array;
+use function is_integer;
+use function is_object;
+use function MongoDB\is_first_key_operator;
 
 /**
  * Operation for replacing a document with the findAndModify command.
@@ -90,15 +94,15 @@ class FindOneAndReplace implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $replacement, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
-        if ( ! is_array($replacement) && ! is_object($replacement)) {
+        if (! is_array($replacement) && ! is_object($replacement)) {
             throw InvalidArgumentException::invalidType('$replacement', $replacement, 'array or object');
         }
 
-        if (\MongoDB\is_first_key_operator($replacement)) {
+        if (is_first_key_operator($replacement)) {
             throw new InvalidArgumentException('First key in $replacement argument is an update operator');
         }
 
@@ -111,7 +115,7 @@ class FindOneAndReplace implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"projection" option', $options['projection'], 'array or object');
         }
 
-        if ( ! is_integer($options['returnDocument'])) {
+        if (! is_integer($options['returnDocument'])) {
             throw InvalidArgumentException::invalidType('"returnDocument" option', $options['returnDocument'], 'integer');
         }
 

src/Operation/FindOneAndUpdate.php

@@ -17,10 +17,14 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function is_array;
+use function is_integer;
+use function is_object;
+use function MongoDB\is_first_key_operator;
 
 /**
  * Operation for updating a document with the findAndModify command.
@@ -93,15 +97,15 @@ class FindOneAndUpdate implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $update, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
-        if ( ! is_array($update) && ! is_object($update)) {
+        if (! is_array($update) && ! is_object($update)) {
             throw InvalidArgumentException::invalidType('$update', $update, 'array or object');
         }
 
-        if ( ! \MongoDB\is_first_key_operator($update)) {
+        if (! is_first_key_operator($update)) {
             throw new InvalidArgumentException('First key in $update argument is not an update operator');
         }
 
@@ -114,7 +118,7 @@ class FindOneAndUpdate implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"projection" option', $options['projection'], 'array or object');
         }
 
-        if ( ! is_integer($options['returnDocument'])) {
+        if (! is_integer($options['returnDocument'])) {
             throw InvalidArgumentException::invalidType('"returnDocument" option', $options['returnDocument'], 'integer');
         }
 

src/Operation/InsertMany.php

@@ -17,14 +17,19 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\InsertManyResult;
 use MongoDB\Driver\BulkWrite as Bulk;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\InsertManyResult;
+use function is_array;
+use function is_bool;
+use function is_object;
+use function MongoDB\server_supports_feature;
+use function sprintf;
 
 /**
  * Operation for inserting multiple documents with the insert command.
@@ -82,7 +87,7 @@ class InsertMany implements Executable
                 throw new InvalidArgumentException(sprintf('$documents is not a list (unexpected index: "%s")', $i));
             }
 
-            if ( ! is_array($document) && ! is_object($document)) {
+            if (! is_array($document) && ! is_object($document)) {
                 throw InvalidArgumentException::invalidType(sprintf('$documents[%d]', $i), $document, 'array or object');
             }
 
@@ -95,7 +100,7 @@ class InsertMany implements Executable
             throw InvalidArgumentException::invalidType('"bypassDocumentValidation" option', $options['bypassDocumentValidation'], 'boolean');
         }
 
-        if ( ! is_bool($options['ordered'])) {
+        if (! is_bool($options['ordered'])) {
             throw InvalidArgumentException::invalidType('"ordered" option', $options['ordered'], 'boolean');
         }
 
@@ -134,9 +139,8 @@ class InsertMany implements Executable
 
         $options = ['ordered' => $this->options['ordered']];
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $options['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }

src/Operation/InsertOne.php

@@ -17,14 +17,18 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\InsertOneResult;
 use MongoDB\Driver\BulkWrite as Bulk;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\InsertOneResult;
+use function is_array;
+use function is_bool;
+use function is_object;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for inserting a single document with the insert command.
@@ -67,7 +71,7 @@ class InsertOne implements Executable
      */
     public function __construct($databaseName, $collectionName, $document, array $options = [])
     {
-        if ( ! is_array($document) && ! is_object($document)) {
+        if (! is_array($document) && ! is_object($document)) {
             throw InvalidArgumentException::invalidType('$document', $document, 'array or object');
         }
 
@@ -110,9 +114,8 @@ class InsertOne implements Executable
             throw UnsupportedException::writeConcernNotSupportedInTransaction();
         }
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $options['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }

src/Operation/ListCollections.php

@@ -18,13 +18,16 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Model\CachingIterator;
 use MongoDB\Model\CollectionInfoCommandIterator;
 use MongoDB\Model\CollectionInfoIterator;
+use function is_array;
+use function is_integer;
+use function is_object;
 
 /**
  * Operation for the listCollections command.
@@ -119,7 +122,7 @@ class ListCollections implements Executable
     {
         $cmd = ['listCollections' => 1];
 
-        if ( ! empty($this->options['filter'])) {
+        if (! empty($this->options['filter'])) {
             $cmd['filter'] = (object) $this->options['filter'];
         }
 

src/Operation/ListDatabases.php

@@ -18,13 +18,17 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Model\DatabaseInfoIterator;
 use MongoDB\Model\DatabaseInfoLegacyIterator;
+use function current;
+use function is_array;
+use function is_integer;
+use function is_object;
 
 /**
  * Operation for the ListDatabases command.
@@ -86,7 +90,7 @@ class ListDatabases implements Executable
     {
         $cmd = ['listDatabases' => 1];
 
-        if ( ! empty($this->options['filter'])) {
+        if (! empty($this->options['filter'])) {
             $cmd['filter'] = (object) $this->options['filter'];
         }
 
@@ -98,7 +102,7 @@ class ListDatabases implements Executable
         $cursor->setTypeMap(['root' => 'array', 'document' => 'array']);
         $result = current($cursor->toArray());
 
-        if ( ! isset($result['databases']) || ! is_array($result['databases'])) {
+        if (! isset($result['databases']) || ! is_array($result['databases'])) {
             throw new UnexpectedValueException('listDatabases command did not return a "databases" array');
         }
 

src/Operation/ListIndexes.php

@@ -17,16 +17,16 @@
 
 namespace MongoDB\Operation;
 
+use EmptyIterator;
 use MongoDB\Driver\Command;
-use MongoDB\Driver\Query;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Model\CachingIterator;
 use MongoDB\Model\IndexInfoIterator;
 use MongoDB\Model\IndexInfoIteratorIterator;
-use EmptyIterator;
+use function is_integer;
 
 /**
  * Operation for the listIndexes command.
@@ -133,7 +133,7 @@ class ListIndexes implements Executable
              * empty iterator instead of throwing.
              */
             if ($e->getCode() === self::$errorCodeNamespaceNotFound || $e->getCode() === self::$errorCodeDatabaseNotFound) {
-                return new IndexInfoIteratorIterator(new EmptyIterator);
+                return new IndexInfoIteratorIterator(new EmptyIterator());
             }
 
             throw $e;

src/Operation/MapReduce.php

@@ -17,20 +17,29 @@
 
 namespace MongoDB\Operation;
 
+use ArrayIterator;
 use MongoDB\BSON\JavascriptInterface;
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
 use MongoDB\MapReduceResult;
-use ArrayIterator;
 use stdClass;
+use function current;
+use function is_array;
+use function is_bool;
+use function is_integer;
+use function is_object;
+use function is_string;
+use function MongoDB\create_field_path_type_map;
+use function MongoDB\is_mapreduce_output_inline;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the mapReduce command.
@@ -143,7 +152,7 @@ class MapReduce implements Executable
      */
     public function __construct($databaseName, $collectionName, JavascriptInterface $map, JavascriptInterface $reduce, $out, array $options = [])
     {
-        if ( ! is_string($out) && ! is_array($out) && ! is_object($out)) {
+        if (! is_string($out) && ! is_array($out) && ! is_object($out)) {
             throw InvalidArgumentException::invalidType('$out', $out, 'string or array or object');
         }
 
@@ -235,15 +244,15 @@ class MapReduce implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
-        if (isset($this->options['readConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForReadConcern)) {
+        if (isset($this->options['readConcern']) && ! server_supports_feature($server, self::$wireVersionForReadConcern)) {
             throw UnsupportedException::readConcernNotSupported();
         }
 
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 
@@ -257,7 +266,7 @@ class MapReduce implements Executable
             }
         }
 
-        $hasOutputCollection = ! \MongoDB\is_mapreduce_output_inline($this->out);
+        $hasOutputCollection = ! is_mapreduce_output_inline($this->out);
 
         $command = $this->createCommand($server);
         $options = $this->createOptions($hasOutputCollection);
@@ -267,7 +276,7 @@ class MapReduce implements Executable
             : $server->executeReadCommand($this->databaseName, $command, $options);
 
         if (isset($this->options['typeMap']) && ! $hasOutputCollection) {
-            $cursor->setTypeMap(\MongoDB\create_field_path_type_map($this->options['typeMap'], 'results.$'));
+            $cursor->setTypeMap(create_field_path_type_map($this->options['typeMap'], 'results.$'));
         }
 
         $result = current($cursor->toArray());
@@ -304,9 +313,8 @@ class MapReduce implements Executable
             }
         }
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }
@@ -328,7 +336,7 @@ class MapReduce implements Executable
         if (isset($result->results) && is_array($result->results)) {
             $results = $result->results;
 
-            return function() use ($results) {
+            return function () use ($results) {
                 return new ArrayIterator($results);
             };
         }
@@ -340,7 +348,7 @@ class MapReduce implements Executable
                 ? new Find($this->databaseName, $result->result, [], $options)
                 : new Find($result->result->db, $result->result->collection, [], $options);
 
-            return function() use ($find, $server) {
+            return function () use ($find, $server) {
                 return $find->execute($server);
             };
         }
@@ -364,7 +372,7 @@ class MapReduce implements Executable
             $options['readConcern'] = $this->options['readConcern'];
         }
 
-        if ( ! $hasOutputCollection && isset($this->options['readPreference'])) {
+        if (! $hasOutputCollection && isset($this->options['readPreference'])) {
             $options['readPreference'] = $this->options['readPreference'];
         }
 

src/Operation/ModifyCollection.php

@@ -18,12 +18,15 @@
 namespace MongoDB\Operation;
 
 use MongoDB\Driver\Command;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use function current;
+use function is_array;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the collMod command.
@@ -56,10 +59,10 @@ class ModifyCollection implements Executable
      *    This is not supported for server versions < 3.2 and will result in an
      *    exception at execution time if used.
      *
-     * @param string       $databaseName      Database name
-     * @param string       $collectionName    Collection or view to modify
-     * @param array        $collectionOptions Collection or view options to assign
-     * @param array        $options           Command options
+     * @param string $databaseName      Database name
+     * @param string $collectionName    Collection or view to modify
+     * @param array  $collectionOptions Collection or view options to assign
+     * @param array  $options           Command options
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function __construct($databaseName, $collectionName, array $collectionOptions, array $options = [])
@@ -100,7 +103,7 @@ class ModifyCollection implements Executable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['writeConcern']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForWriteConcern)) {
+        if (isset($this->options['writeConcern']) && ! server_supports_feature($server, self::$wireVersionForWriteConcern)) {
             throw UnsupportedException::writeConcernNotSupported();
         }
 

src/Operation/ReplaceOne.php

@@ -17,11 +17,14 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\UpdateResult;
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\UpdateResult;
+use function is_array;
+use function is_object;
+use function MongoDB\is_first_key_operator;
 
 /**
  * Operation for replacing a single document with the update command.
@@ -68,11 +71,11 @@ class ReplaceOne implements Executable
      */
     public function __construct($databaseName, $collectionName, $filter, $replacement, array $options = [])
     {
-        if ( ! is_array($replacement) && ! is_object($replacement)) {
+        if (! is_array($replacement) && ! is_object($replacement)) {
             throw InvalidArgumentException::invalidType('$replacement', $replacement, 'array or object');
         }
 
-        if (\MongoDB\is_first_key_operator($replacement)) {
+        if (is_first_key_operator($replacement)) {
             throw new InvalidArgumentException('First key in $replacement argument is an update operator');
         }
 

src/Operation/Update.php

@@ -17,14 +17,19 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\UpdateResult;
 use MongoDB\Driver\BulkWrite as Bulk;
+use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\Session;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\UpdateResult;
+use function is_array;
+use function is_bool;
+use function is_object;
+use function MongoDB\is_first_key_operator;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for the update command.
@@ -92,11 +97,11 @@ class Update implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $update, array $options = [])
     {
-        if ( ! is_array($filter) && ! is_object($filter)) {
+        if (! is_array($filter) && ! is_object($filter)) {
             throw InvalidArgumentException::invalidType('$filter', $filter, 'array or object');
         }
 
-        if ( ! is_array($update) && ! is_object($update)) {
+        if (! is_array($update) && ! is_object($update)) {
             throw InvalidArgumentException::invalidType('$update', $filter, 'array or object');
         }
 
@@ -117,11 +122,11 @@ class Update implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"collation" option', $options['collation'], 'array or object');
         }
 
-        if ( ! is_bool($options['multi'])) {
+        if (! is_bool($options['multi'])) {
             throw InvalidArgumentException::invalidType('"multi" option', $options['multi'], 'boolean');
         }
 
-        if ($options['multi'] && ! \MongoDB\is_first_key_operator($update)) {
+        if ($options['multi'] && ! is_first_key_operator($update)) {
             throw new InvalidArgumentException('"multi" option cannot be true if $update is a replacement document');
         }
 
@@ -129,7 +134,7 @@ class Update implements Executable, Explainable
             throw InvalidArgumentException::invalidType('"session" option', $options['session'], Session::class);
         }
 
-        if ( ! is_bool($options['upsert'])) {
+        if (! is_bool($options['upsert'])) {
             throw InvalidArgumentException::invalidType('"upsert" option', $options['upsert'], 'boolean');
         }
 
@@ -159,11 +164,11 @@ class Update implements Executable, Explainable
      */
     public function execute(Server $server)
     {
-        if (isset($this->options['arrayFilters']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForArrayFilters)) {
+        if (isset($this->options['arrayFilters']) && ! server_supports_feature($server, self::$wireVersionForArrayFilters)) {
             throw UnsupportedException::arrayFiltersNotSupported();
         }
 
-        if (isset($this->options['collation']) && ! \MongoDB\server_supports_feature($server, self::$wireVersionForCollation)) {
+        if (isset($this->options['collation']) && ! server_supports_feature($server, self::$wireVersionForCollation)) {
             throw UnsupportedException::collationNotSupported();
         }
 
@@ -174,9 +179,8 @@ class Update implements Executable, Explainable
 
         $bulkOptions = [];
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $bulkOptions['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }
@@ -197,9 +201,8 @@ class Update implements Executable, Explainable
             $cmd['writeConcern'] = $this->options['writeConcern'];
         }
 
-        if (
-            ! empty($this->options['bypassDocumentValidation']) &&
-            \MongoDB\server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
+        if (! empty($this->options['bypassDocumentValidation']) &&
+            server_supports_feature($server, self::$wireVersionForDocumentLevelValidation)
         ) {
             $cmd['bypassDocumentValidation'] = $this->options['bypassDocumentValidation'];
         }

src/Operation/UpdateMany.php

@@ -17,11 +17,14 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\UpdateResult;
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\UpdateResult;
+use function is_array;
+use function is_object;
+use function MongoDB\is_first_key_operator;
 
 /**
  * Operation for updating multiple documents with the update command.
@@ -74,11 +77,11 @@ class UpdateMany implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $update, array $options = [])
     {
-        if ( ! is_array($update) && ! is_object($update)) {
+        if (! is_array($update) && ! is_object($update)) {
             throw InvalidArgumentException::invalidType('$update', $update, 'array or object');
         }
 
-        if ( ! \MongoDB\is_first_key_operator($update)) {
+        if (! is_first_key_operator($update)) {
             throw new InvalidArgumentException('First key in $update argument is not an update operator');
         }
 

src/Operation/UpdateOne.php

@@ -17,11 +17,14 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\UpdateResult;
-use MongoDB\Driver\Server;
 use MongoDB\Driver\Exception\RuntimeException as DriverRuntimeException;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\UpdateResult;
+use function is_array;
+use function is_object;
+use function MongoDB\is_first_key_operator;
 
 /**
  * Operation for updating a single document with the update command.
@@ -74,11 +77,11 @@ class UpdateOne implements Executable, Explainable
      */
     public function __construct($databaseName, $collectionName, $filter, $update, array $options = [])
     {
-        if ( ! is_array($update) && ! is_object($update)) {
+        if (! is_array($update) && ! is_object($update)) {
             throw InvalidArgumentException::invalidType('$update', $update, 'array or object');
         }
 
-        if ( ! \MongoDB\is_first_key_operator($update)) {
+        if (! is_first_key_operator($update)) {
             throw new InvalidArgumentException('First key in $update argument is not an update operator');
         }
 

src/Operation/Watch.php

@@ -17,24 +17,30 @@
 
 namespace MongoDB\Operation;
 
-use MongoDB\ChangeStream;
 use MongoDB\BSON\TimestampInterface;
-use MongoDB\Model\ChangeStreamIterator;
-use MongoDB\Driver\Command;
+use MongoDB\ChangeStream;
 use MongoDB\Driver\Cursor;
-use MongoDB\Driver\Manager;
-use MongoDB\Driver\ReadConcern;
-use MongoDB\Driver\ReadPreference;
-use MongoDB\Driver\Server;
-use MongoDB\Driver\Session;
 use MongoDB\Driver\Exception\RuntimeException;
+use MongoDB\Driver\Manager;
 use MongoDB\Driver\Monitoring\CommandFailedEvent;
-use MongoDB\Driver\Monitoring\CommandSubscriber;
 use MongoDB\Driver\Monitoring\CommandStartedEvent;
+use MongoDB\Driver\Monitoring\CommandSubscriber;
 use MongoDB\Driver\Monitoring\CommandSucceededEvent;
+use MongoDB\Driver\ReadPreference;
+use MongoDB\Driver\Server;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Exception\UnexpectedValueException;
 use MongoDB\Exception\UnsupportedException;
+use MongoDB\Model\ChangeStreamIterator;
+use function array_intersect_key;
+use function array_unshift;
+use function count;
+use function is_array;
+use function is_object;
+use function is_string;
+use function MongoDB\Driver\Monitoring\addSubscriber;
+use function MongoDB\Driver\Monitoring\removeSubscriber;
+use function MongoDB\server_supports_feature;
 
 /**
  * Operation for creating a change stream with the aggregate command.
@@ -131,11 +137,11 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
      * for the collection name. A cluster-level change stream may be created by
      * specifying null for both the database and collection name.
      *
-     * @param Manager        $manager        Manager instance from the driver
-     * @param string|null    $databaseName   Database name
-     * @param string|null    $collectionName Collection name
-     * @param array          $pipeline       List of pipeline operations
-     * @param array          $options        Command options
+     * @param Manager     $manager        Manager instance from the driver
+     * @param string|null $databaseName   Database name
+     * @param string|null $collectionName Collection name
+     * @param array       $pipeline       List of pipeline operations
+     * @param array       $options        Command options
      * @throws InvalidArgumentException for parameter/option parsing errors
      */
     public function __construct(Manager $manager, $databaseName, $collectionName, array $pipeline, array $options = [])
@@ -170,7 +176,7 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
          * ("implicit from the user's perspective" per PHPLIB-342). Since this
          * is filling in for an implicit session, we default "causalConsistency"
          * to false. */
-        if ( ! isset($options['session'])) {
+        if (! isset($options['session'])) {
             try {
                 $options['session'] = $manager->startSession(['causalConsistency' => false]);
             } catch (RuntimeException $e) {
@@ -221,7 +227,7 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
 
         $reply = $event->getReply();
 
-        if ( ! isset($reply->cursor->firstBatch) || ! is_array($reply->cursor->firstBatch)) {
+        if (! isset($reply->cursor->firstBatch) || ! is_array($reply->cursor->firstBatch)) {
             throw new UnexpectedValueException('aggregate command did not return a "cursor.firstBatch" array');
         }
 
@@ -250,7 +256,9 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
     {
         return new ChangeStream(
             $this->createChangeStreamIterator($server),
-            function($resumeToken, $hasAdvanced) { return $this->resume($resumeToken, $hasAdvanced); }
+            function ($resumeToken, $hasAdvanced) {
+                return $this->resume($resumeToken, $hasAdvanced);
+            }
         );
     }
 
@@ -296,12 +304,12 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
      */
     private function executeAggregate(Server $server)
     {
-        \MongoDB\Driver\Monitoring\addSubscriber($this);
+        addSubscriber($this);
 
         try {
             return $this->aggregate->execute($server);
         } finally {
-            \MongoDB\Driver\Monitoring\removeSubscriber($this);
+            removeSubscriber($this);
         }
     }
 
@@ -348,7 +356,7 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
         // Select a new server using the original read preference
         $server = $this->manager->selectServer($this->aggregateOptions['readPreference']);
 
-        $resumeOption = isset($this->changeStreamOptions['startAfter']) && !$hasAdvanced ? 'startAfter' : 'resumeAfter';
+        $resumeOption = isset($this->changeStreamOptions['startAfter']) && ! $hasAdvanced ? 'startAfter' : 'resumeAfter';
 
         unset($this->changeStreamOptions['resumeAfter']);
         unset($this->changeStreamOptions['startAfter']);
@@ -395,7 +403,7 @@ class Watch implements Executable, /* @internal */ CommandSubscriber
             return false;
         }
 
-        if ( ! \MongoDB\server_supports_feature($server, self::$wireVersionForStartAtOperationTime)) {
+        if (! server_supports_feature($server, self::$wireVersionForStartAtOperationTime)) {
             return false;
         }
 

src/UpdateResult.php

@@ -29,8 +29,6 @@ class UpdateResult
     private $isAcknowledged;
 
     /**
-     * Constructor.
-     *
      * @param WriteResult $writeResult
      */
     public function __construct(WriteResult $writeResult)

src/functions.php

@@ -18,13 +18,22 @@
 namespace MongoDB;
 
 use MongoDB\BSON\Serializable;
-use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\Server;
-use MongoDB\Driver\WriteConcern;
+use MongoDB\Driver\Session;
 use MongoDB\Exception\InvalidArgumentException;
-use ReflectionException;
-use stdClass;
 use ReflectionClass;
+use ReflectionException;
+use function end;
+use function get_object_vars;
+use function in_array;
+use function is_array;
+use function is_object;
+use function is_string;
+use function key;
+use function MongoDB\BSON\fromPHP;
+use function MongoDB\BSON\toPHP;
+use function reset;
+use function substr;
 
 /**
  * Applies a type map to a document.
@@ -41,11 +50,11 @@ use ReflectionClass;
  */
 function apply_type_map_to_document($document, array $typeMap)
 {
-    if ( ! is_array($document) && ! is_object($document)) {
+    if (! is_array($document) && ! is_object($document)) {
         throw InvalidArgumentException::invalidType('$document', $document, 'array or object');
     }
 
-    return \MongoDB\BSON\toPHP(\MongoDB\BSON\fromPHP($document), $typeMap);
+    return toPHP(fromPHP($document), $typeMap);
 }
 
 /**
@@ -67,7 +76,7 @@ function generate_index_name($document)
         $document = get_object_vars($document);
     }
 
-    if ( ! is_array($document)) {
+    if (! is_array($document)) {
         throw InvalidArgumentException::invalidType('$document', $document, 'array or object');
     }
 
@@ -100,14 +109,14 @@ function is_first_key_operator($document)
         $document = get_object_vars($document);
     }
 
-    if ( ! is_array($document)) {
+    if (! is_array($document)) {
         throw InvalidArgumentException::invalidType('$document', $document, 'array or object');
     }
 
     reset($document);
     $firstKey = (string) key($document);
 
-    return (isset($firstKey[0]) && $firstKey[0] === '$');
+    return isset($firstKey[0]) && $firstKey[0] === '$';
 }
 
 /**
@@ -119,7 +128,7 @@ function is_first_key_operator($document)
  */
 function is_in_transaction(array $options)
 {
-    if (isset($options['session']) && $options['session'] instanceof \MongoDB\Driver\Session && $options['session']->isInTransaction()) {
+    if (isset($options['session']) && $options['session'] instanceof Session && $options['session']->isInTransaction()) {
         return true;
     }
 
@@ -162,7 +171,7 @@ function is_last_pipeline_operator_write(array $pipeline)
  */
 function is_mapreduce_output_inline($out)
 {
-    if ( ! is_array($out) && ! is_object($out)) {
+    if (! is_array($out) && ! is_object($out)) {
         return false;
     }
 
@@ -174,7 +183,7 @@ function is_mapreduce_output_inline($out)
         $out = get_object_vars($out);
     }
 
-    if ( ! is_array($out)) {
+    if (! is_array($out)) {
         throw InvalidArgumentException::invalidType('$out', $out, 'array or object');
     }
 
@@ -197,18 +206,20 @@ function server_supports_feature(Server $server, $feature)
     $maxWireVersion = isset($info['maxWireVersion']) ? (integer) $info['maxWireVersion'] : 0;
     $minWireVersion = isset($info['minWireVersion']) ? (integer) $info['minWireVersion'] : 0;
 
-    return ($minWireVersion <= $feature && $maxWireVersion >= $feature);
+    return $minWireVersion <= $feature && $maxWireVersion >= $feature;
 }
 
-function is_string_array($input) {
-    if (!is_array($input)){
+function is_string_array($input)
+{
+    if (! is_array($input)) {
         return false;
     }
-    foreach($input as $item) {
-        if (!is_string($item)) {
+    foreach ($input as $item) {
+        if (! is_string($item)) {
             return false;
         }
     }
+
     return true;
 }
 
@@ -223,19 +234,21 @@ function is_string_array($input) {
  * @return mixed
  * @throws ReflectionException
  */
-function recursive_copy($element) {
+function recursive_copy($element)
+{
     if (is_array($element)) {
         foreach ($element as $key => $value) {
             $element[$key] = recursive_copy($value);
         }
+
         return $element;
     }
 
-    if ( ! is_object($element)) {
+    if (! is_object($element)) {
         return $element;
     }
 
-    if ( ! (new ReflectionClass($element))->isCloneable()) {
+    if (! (new ReflectionClass($element))->isCloneable()) {
         return $element;
     }
 

tests/ClientFunctionalTest.php

@@ -4,9 +4,15 @@ namespace MongoDB\Tests;
 
 use MongoDB\Client;
 use MongoDB\Driver\BulkWrite;
-use MongoDB\Driver\Command;
+use MongoDB\Driver\Manager;
+use MongoDB\Driver\Session;
 use MongoDB\Model\DatabaseInfo;
+use MongoDB\Model\DatabaseInfoIterator;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
+use function call_user_func;
+use function is_callable;
+use function sprintf;
+use function version_compare;
 
 /**
  * Functional tests for the Client class.
@@ -27,7 +33,7 @@ class ClientFunctionalTest extends FunctionalTestCase
 
     public function testGetManager()
     {
-        $this->assertInstanceOf(\MongoDB\Driver\Manager::class, $this->client->getManager());
+        $this->assertInstanceOf(Manager::class, $this->client->getManager());
     }
 
     public function testDropDatabase()
@@ -53,14 +59,14 @@ class ClientFunctionalTest extends FunctionalTestCase
 
         $databases = $this->client->listDatabases();
 
-        $this->assertInstanceOf(\MongoDB\Model\DatabaseInfoIterator::class, $databases);
+        $this->assertInstanceOf(DatabaseInfoIterator::class, $databases);
 
         foreach ($databases as $database) {
-            $this->assertInstanceOf(\MongoDB\Model\DatabaseInfo::class, $database);
+            $this->assertInstanceOf(DatabaseInfo::class, $database);
         }
 
         $that = $this;
-        $this->assertDatabaseExists($this->getDatabaseName(), function(DatabaseInfo $info) use ($that) {
+        $this->assertDatabaseExists($this->getDatabaseName(), function (DatabaseInfo $info) use ($that) {
             $that->assertFalse($info->isEmpty());
             $that->assertGreaterThan(0, $info->getSizeOnDisk());
         });
@@ -74,7 +80,7 @@ class ClientFunctionalTest extends FunctionalTestCase
      * the given name is found, it will be passed to the callback, which may
      * perform additional assertions.
      *
-     * @param string $databaseName
+     * @param string   $databaseName
      * @param callable $callback
      */
     private function assertDatabaseExists($databaseName, $callback = null)
@@ -106,6 +112,6 @@ class ClientFunctionalTest extends FunctionalTestCase
         if (version_compare($this->getFeatureCompatibilityVersion(), '3.6', '<')) {
             $this->markTestSkipped('startSession() is only supported on FCV 3.6 or higher');
         }
-        $this->assertInstanceOf(\MongoDB\Driver\Session::class, $this->client->startSession());
+        $this->assertInstanceOf(Session::class, $this->client->startSession());
     }
 }

tests/ClientTest.php

@@ -63,13 +63,13 @@ class ClientTest extends TestCase
         $collection = $client->selectCollection($this->getDatabaseName(), $this->getCollectionName());
         $debug = $collection->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -86,13 +86,13 @@ class ClientTest extends TestCase
         $collection = $client->selectCollection($this->getDatabaseName(), $this->getCollectionName(), $collectionOptions);
         $debug = $collection->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -105,7 +105,7 @@ class ClientTest extends TestCase
         $debug = $database->__debugInfo();
 
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -125,13 +125,13 @@ class ClientTest extends TestCase
         $database = $client->selectDatabase($this->getDatabaseName());
         $debug = $database->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -148,13 +148,13 @@ class ClientTest extends TestCase
         $database = $client->selectDatabase($this->getDatabaseName(), $databaseOptions);
         $debug = $database->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 }

tests/Collection/FunctionalTestCase.php

@@ -3,7 +3,6 @@
 namespace MongoDB\Tests\Collection;
 
 use MongoDB\Collection;
-use MongoDB\Driver\WriteConcern;
 use MongoDB\Tests\FunctionalTestCase as BaseFunctionalTestCase;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
 

tests/CommandObserver.php

@@ -2,11 +2,14 @@
 
 namespace MongoDB\Tests;
 
+use Exception;
 use MongoDB\Driver\Monitoring\CommandFailedEvent;
 use MongoDB\Driver\Monitoring\CommandStartedEvent;
-use MongoDB\Driver\Monitoring\CommandSucceededEvent;
 use MongoDB\Driver\Monitoring\CommandSubscriber;
-use Exception;
+use MongoDB\Driver\Monitoring\CommandSucceededEvent;
+use function call_user_func;
+use function MongoDB\Driver\Monitoring\addSubscriber;
+use function MongoDB\Driver\Monitoring\removeSubscriber;
 
 /**
  * Observes command documents using the driver's monitoring API.
@@ -19,13 +22,14 @@ class CommandObserver implements CommandSubscriber
     {
         $this->commands = [];
 
-        \MongoDB\Driver\Monitoring\addSubscriber($this);
+        addSubscriber($this);
 
         try {
             call_user_func($execution);
-        } catch (Exception $executionException) {}
+        } catch (Exception $executionException) {
+        }
 
-        \MongoDB\Driver\Monitoring\removeSubscriber($this);
+        removeSubscriber($this);
 
         foreach ($this->commands as $command) {
             call_user_func($commandCallback, $command);

tests/Database/CollectionManagementFunctionalTest.php

@@ -2,9 +2,13 @@
 
 namespace MongoDB\Tests\Database;
 
+use InvalidArgumentException;
 use MongoDB\Driver\BulkWrite;
 use MongoDB\Model\CollectionInfo;
-use InvalidArgumentException;
+use MongoDB\Model\CollectionInfoIterator;
+use function call_user_func;
+use function is_callable;
+use function sprintf;
 
 /**
  * Functional tests for collection management methods.
@@ -18,7 +22,7 @@ class CollectionManagementFunctionalTest extends FunctionalTestCase
 
         $commandResult = $this->database->createCollection($basicCollectionName);
         $this->assertCommandSucceeded($commandResult);
-        $this->assertCollectionExists($basicCollectionName, function(CollectionInfo $info) use ($that) {
+        $this->assertCollectionExists($basicCollectionName, function (CollectionInfo $info) use ($that) {
             $that->assertFalse($info->isCapped());
         });
 
@@ -31,7 +35,7 @@ class CollectionManagementFunctionalTest extends FunctionalTestCase
 
         $commandResult = $this->database->createCollection($cappedCollectionName, $cappedCollectionOptions);
         $this->assertCommandSucceeded($commandResult);
-        $this->assertCollectionExists($cappedCollectionName, function(CollectionInfo $info) use ($that) {
+        $this->assertCollectionExists($cappedCollectionName, function (CollectionInfo $info) use ($that) {
             $that->assertTrue($info->isCapped());
             $that->assertEquals(100, $info->getCappedMax());
             $that->assertEquals(1048576, $info->getCappedSize());
@@ -57,10 +61,10 @@ class CollectionManagementFunctionalTest extends FunctionalTestCase
         $this->assertCommandSucceeded($commandResult);
 
         $collections = $this->database->listCollections();
-        $this->assertInstanceOf(\MongoDB\Model\CollectionInfoIterator::class, $collections);
+        $this->assertInstanceOf(CollectionInfoIterator::class, $collections);
 
         foreach ($collections as $collection) {
-            $this->assertInstanceOf(\MongoDB\Model\CollectionInfo::class, $collection);
+            $this->assertInstanceOf(CollectionInfo::class, $collection);
         }
     }
 
@@ -73,10 +77,10 @@ class CollectionManagementFunctionalTest extends FunctionalTestCase
         $options = ['filter' => ['name' => $collectionName]];
 
         $collections = $this->database->listCollections($options);
-        $this->assertInstanceOf(\MongoDB\Model\CollectionInfoIterator::class, $collections);
+        $this->assertInstanceOf(CollectionInfoIterator::class, $collections);
 
         foreach ($collections as $collection) {
-            $this->assertInstanceOf(\MongoDB\Model\CollectionInfo::class, $collection);
+            $this->assertInstanceOf(CollectionInfo::class, $collection);
             $this->assertEquals($collectionName, $collection->getName());
         }
     }

tests/Database/DatabaseFunctionalTest.php

@@ -4,11 +4,14 @@ namespace MongoDB\Tests\Database;
 
 use MongoDB\Database;
 use MongoDB\Driver\BulkWrite;
+use MongoDB\Driver\Cursor;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Operation\CreateIndexes;
+use function array_key_exists;
+use function current;
 
 /**
  * Functional tests for the Database class.
@@ -89,7 +92,7 @@ class DatabaseFunctionalTest extends FunctionalTestCase
 
         $cursor = $this->database->command($command, $options);
 
-        $this->assertInstanceOf(\MongoDB\Driver\Cursor::class, $cursor);
+        $this->assertInstanceOf(Cursor::class, $cursor);
         $commandResult = current($cursor->toArray());
 
         $this->assertCommandSucceeded($commandResult);
@@ -107,7 +110,7 @@ class DatabaseFunctionalTest extends FunctionalTestCase
 
         $cursor = $this->database->command($command, $options);
 
-        $this->assertInstanceOf(\MongoDB\Driver\Cursor::class, $cursor);
+        $this->assertInstanceOf(Cursor::class, $cursor);
         $commandResult = current($cursor->toArray());
 
         $this->assertCommandSucceeded($commandResult);
@@ -149,7 +152,7 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $this->assertSame($this->manager, $debug['manager']);
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
         $this->assertSame($this->getCollectionName(), $debug['collectionName']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -186,7 +189,6 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         }
     }
 
-
     public function testSelectCollectionInheritsOptions()
     {
         $databaseOptions = [
@@ -203,13 +205,13 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $this->assertSame($this->manager, $debug['manager']);
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
         $this->assertSame($this->getCollectionName(), $debug['collectionName']);
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -225,13 +227,13 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $collection = $this->database->selectCollection($this->getCollectionName(), $collectionOptions);
         $debug = $collection->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -251,11 +253,11 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
         $this->assertSame('fs', $debug['bucketName']);
         $this->assertSame(261120, $debug['chunkSizeBytes']);
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -276,11 +278,11 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
         $this->assertSame('custom_fs', $debug['bucketName']);
         $this->assertSame(8192, $debug['chunkSizeBytes']);
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -299,13 +301,13 @@ class DatabaseFunctionalTest extends FunctionalTestCase
 
         $this->assertSame($this->manager, $debug['manager']);
         $this->assertSame($this->getDatabaseName(), $debug['databaseName']);
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 
@@ -321,13 +323,13 @@ class DatabaseFunctionalTest extends FunctionalTestCase
         $clone = $this->database->withOptions($databaseOptions);
         $debug = $clone->__debugInfo();
 
-        $this->assertInstanceOf(\MongoDB\Driver\ReadConcern::class, $debug['readConcern']);
+        $this->assertInstanceOf(ReadConcern::class, $debug['readConcern']);
         $this->assertSame(ReadConcern::LOCAL, $debug['readConcern']->getLevel());
-        $this->assertInstanceOf(\MongoDB\Driver\ReadPreference::class, $debug['readPreference']);
+        $this->assertInstanceOf(ReadPreference::class, $debug['readPreference']);
         $this->assertSame(ReadPreference::RP_SECONDARY_PREFERRED, $debug['readPreference']->getMode());
         $this->assertIsArray($debug['typeMap']);
         $this->assertSame(['root' => 'array'], $debug['typeMap']);
-        $this->assertInstanceOf(\MongoDB\Driver\WriteConcern::class, $debug['writeConcern']);
+        $this->assertInstanceOf(WriteConcern::class, $debug['writeConcern']);
         $this->assertSame(WriteConcern::MAJORITY, $debug['writeConcern']->getW());
     }
 }

tests/FunctionalTestCase.php

@@ -2,21 +2,33 @@
 
 namespace MongoDB\Tests;
 
+use InvalidArgumentException;
+use MongoDB\BSON\ObjectId;
 use MongoDB\Driver\Command;
-use MongoDB\Driver\Cursor;
+use MongoDB\Driver\Exception\CommandException;
 use MongoDB\Driver\Manager;
-use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Query;
+use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\Server;
 use MongoDB\Driver\WriteConcern;
-use MongoDB\Driver\Exception\CommandException;
 use MongoDB\Operation\CreateCollection;
 use MongoDB\Operation\DatabaseCommand;
 use MongoDB\Operation\DropCollection;
-use InvalidArgumentException;
 use stdClass;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
 use UnexpectedValueException;
+use function array_merge;
+use function count;
+use function current;
+use function explode;
+use function implode;
+use function is_array;
+use function is_object;
+use function is_string;
+use function key;
+use function parse_url;
+use function preg_match;
+use function version_compare;
 
 abstract class FunctionalTestCase extends TestCase
 {
@@ -75,9 +87,7 @@ abstract class FunctionalTestCase extends TestCase
             $hosts[$numHosts-1] .= ':' . $urlParts['port'];
         }
 
-        $parts = [
-            'mongodb://'
-        ];
+        $parts = ['mongodb://'];
 
         if (isset($urlParts['user'], $urlParts['pass'])) {
             $parts += [
@@ -96,7 +106,7 @@ abstract class FunctionalTestCase extends TestCase
         if (isset($urlParts['query'])) {
             $parts = array_merge($parts, [
                 '?',
-                $urlParts['query']
+                $urlParts['query'],
             ]);
         }
 
@@ -125,8 +135,8 @@ abstract class FunctionalTestCase extends TestCase
 
     protected function assertSameObjectId($expectedObjectId, $actualObjectId)
     {
-        $this->assertInstanceOf(\MongoDB\BSON\ObjectId::class, $expectedObjectId);
-        $this->assertInstanceOf(\MongoDB\BSON\ObjectId::class, $actualObjectId);
+        $this->assertInstanceOf(ObjectId::class, $expectedObjectId);
+        $this->assertInstanceOf(ObjectId::class, $actualObjectId);
         $this->assertEquals((string) $expectedObjectId, (string) $actualObjectId);
     }
 
@@ -153,7 +163,7 @@ abstract class FunctionalTestCase extends TestCase
             $command = (object) $command;
         }
 
-        if ( ! $command instanceof stdClass) {
+        if (! $command instanceof stdClass) {
             throw new InvalidArgumentException('$command is not an array or stdClass instance');
         }
 
@@ -300,7 +310,7 @@ abstract class FunctionalTestCase extends TestCase
         $cursor->setTypeMap(['root' => 'array', 'document' => 'array']);
         $document = current($cursor->toArray());
 
-        if (! $document ) {
+        if (! $document) {
             return false;
         }
 
@@ -314,13 +324,12 @@ abstract class FunctionalTestCase extends TestCase
 
     protected function skipIfChangeStreamIsNotSupported()
     {
-        switch ( $this->getPrimaryServer()->getType() )
-        {
+        switch ($this->getPrimaryServer()->getType()) {
             case Server::TYPE_MONGOS:
                 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
                     $this->markTestSkipped('$changeStream is only supported on MongoDB 3.6 or higher');
                 }
-                if (!$this->isShardedClusterUsingReplicasets()) {
+                if (! $this->isShardedClusterUsingReplicasets()) {
                     $this->markTestSkipped('$changeStream is only supported with replicasets');
                 }
 
@@ -341,13 +350,12 @@ abstract class FunctionalTestCase extends TestCase
 
     protected function skipIfCausalConsistencyIsNotSupported()
     {
-        switch ( $this->getPrimaryServer()->getType() )
-        {
+        switch ($this->getPrimaryServer()->getType()) {
             case Server::TYPE_MONGOS:
                 if (version_compare($this->getServerVersion(), '3.6.0', '<')) {
                     $this->markTestSkipped('Causal Consistency is only supported on MongoDB 3.6 or higher');
                 }
-                if (!$this->isShardedClusterUsingReplicasets()) {
+                if (! $this->isShardedClusterUsingReplicasets()) {
                     $this->markTestSkipped('Causal Consistency is only supported with replicasets');
                 }
                 break;

tests/FunctionsTest.php

@@ -2,11 +2,14 @@
 
 namespace MongoDB\Tests;
 
+use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\Model\BSONArray;
 use MongoDB\Model\BSONDocument;
-use MongoDB\Driver\ReadConcern;
-use MongoDB\Driver\WriteConcern;
-use MongoDB\Exception\InvalidArgumentException;
+use function MongoDB\apply_type_map_to_document;
+use function MongoDB\create_field_path_type_map;
+use function MongoDB\generate_index_name;
+use function MongoDB\is_first_key_operator;
+use function MongoDB\is_mapreduce_output_inline;
 
 /**
  * Unit tests for utility functions.
@@ -18,7 +21,7 @@ class FunctionsTest extends TestCase
      */
     public function testApplyTypeMapToDocument($document, array $typeMap, $expectedDocument)
     {
-        $this->assertEquals($expectedDocument, \MongoDB\apply_type_map_to_document($document, $typeMap));
+        $this->assertEquals($expectedDocument, apply_type_map_to_document($document, $typeMap));
     }
 
     public function provideDocumentAndTypeMap()
@@ -61,37 +64,27 @@ class FunctionsTest extends TestCase
             [
                 [
                     'x' => 1,
-                    'random' => [
-                        'foo' => 'bar',
-                    ],
+                    'random' => ['foo' => 'bar'],
                     'value' => [
                         'bar' => 'baz',
-                        'embedded' => [
-                            'foo' => 'bar',
-                        ],
+                        'embedded' => ['foo' => 'bar'],
                     ],
                 ],
                 [
                     'root' => 'array',
                     'document' => 'stdClass',
                     'array' => 'array',
-                    'fieldPaths' => [
-                        'value' => 'array',
-                    ],
+                    'fieldPaths' => ['value' => 'array'],
                 ],
                 [
                     'x' => 1,
-                    'random' => (object) [
-                        'foo' => 'bar',
-                    ],
+                    'random' => (object) ['foo' => 'bar'],
                     'value' => [
                         'bar' => 'baz',
-                        'embedded' => (object) [
-                            'foo' => 'bar',
-                        ],
+                        'embedded' => (object) ['foo' => 'bar'],
                     ],
                 ],
-            ]
+            ],
         ];
     }
 
@@ -100,7 +93,7 @@ class FunctionsTest extends TestCase
      */
     public function testGenerateIndexName($document, $expectedName)
     {
-        $this->assertSame($expectedName, \MongoDB\generate_index_name($document));
+        $this->assertSame($expectedName, generate_index_name($document));
     }
 
     public function provideIndexSpecificationDocumentsAndGeneratedNames()
@@ -120,7 +113,7 @@ class FunctionsTest extends TestCase
     public function testGenerateIndexNameArgumentTypeCheck($document)
     {
         $this->expectException(InvalidArgumentException::class);
-        \MongoDB\generate_index_name($document);
+        generate_index_name($document);
     }
 
     /**
@@ -128,7 +121,7 @@ class FunctionsTest extends TestCase
      */
     public function testIsFirstKeyOperator($document, $isFirstKeyOperator)
     {
-        $this->assertSame($isFirstKeyOperator, \MongoDB\is_first_key_operator($document));
+        $this->assertSame($isFirstKeyOperator, is_first_key_operator($document));
     }
 
     public function provideIsFirstKeyOperatorDocuments()
@@ -149,7 +142,7 @@ class FunctionsTest extends TestCase
     public function testIsFirstKeyOperatorArgumentTypeCheck($document)
     {
         $this->expectException(InvalidArgumentException::class);
-        \MongoDB\is_first_key_operator($document);
+        is_first_key_operator($document);
     }
 
     /**
@@ -157,7 +150,7 @@ class FunctionsTest extends TestCase
      */
     public function testIsMapReduceOutputInline($out, $isInline)
     {
-        $this->assertSame($isInline, \MongoDB\is_mapreduce_output_inline($out));
+        $this->assertSame($isInline, is_mapreduce_output_inline($out));
     }
 
     public function provideMapReduceOutValues()
@@ -175,7 +168,7 @@ class FunctionsTest extends TestCase
      */
     public function testCreateFieldPathTypeMap(array $expected, array $typeMap, $fieldPath = 'field')
     {
-        $this->assertEquals($expected, \MongoDB\create_field_path_type_map($typeMap, $fieldPath));
+        $this->assertEquals($expected, create_field_path_type_map($typeMap, $fieldPath));
     }
 
     public function provideTypeMapValues()
@@ -205,14 +198,12 @@ class FunctionsTest extends TestCase
                         'field' => 'array',
                         'field.$' => 'object',
                         'field.$.nested' => 'array',
-                    ]
+                    ],
                 ],
                 [
                     'root' => 'object',
                     'array' => 'MongoDB\Model\BSONArray',
-                    'fieldPaths' => [
-                        'nested' => 'array',
-                    ]
+                    'fieldPaths' => ['nested' => 'array'],
                 ],
                 'field.$',
             ],
@@ -223,13 +214,11 @@ class FunctionsTest extends TestCase
                     'fieldPaths' => [
                         'field' => 'array',
                         'field.$.nested' => 'array',
-                    ]
+                    ],
                 ],
                 [
                     'array' => 'MongoDB\Model\BSONArray',
-                    'fieldPaths' => [
-                        'nested' => 'array',
-                    ]
+                    'fieldPaths' => ['nested' => 'array'],
                 ],
                 'field.$',
             ],

tests/GridFS/BucketFunctionalTest.php

@@ -3,16 +3,32 @@
 namespace MongoDB\Tests\GridFS;
 
 use MongoDB\BSON\Binary;
+use MongoDB\Collection;
 use MongoDB\Driver\ReadConcern;
 use MongoDB\Driver\ReadPreference;
 use MongoDB\Driver\WriteConcern;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\GridFS\Bucket;
 use MongoDB\GridFS\Exception\FileNotFoundException;
+use MongoDB\Model\BSONDocument;
 use MongoDB\Model\IndexInfo;
 use MongoDB\Operation\ListCollections;
 use MongoDB\Operation\ListIndexes;
 use PHPUnit\Framework\Error\Warning;
+use function array_merge;
+use function call_user_func;
+use function current;
+use function fclose;
+use function fread;
+use function fwrite;
+use function hash_init;
+use function is_callable;
+use function min;
+use function sprintf;
+use function str_repeat;
+use function stream_get_contents;
+use function strlen;
+use function substr;
 
 /**
  * Functional tests for the Bucket class.
@@ -137,7 +153,8 @@ class BucketFunctionalTest extends FunctionalTestCase
         try {
             $this->bucket->delete($id);
             $this->fail('FileNotFoundException was not thrown');
-        } catch (FileNotFoundException $e) {}
+        } catch (FileNotFoundException $e) {
+        }
 
         $this->assertCollectionCount($this->chunksCollection, 0);
     }
@@ -323,7 +340,7 @@ class BucketFunctionalTest extends FunctionalTestCase
         $cursor = $this->bucket->find();
         $fileDocument = current($cursor->toArray());
 
-        $this->assertInstanceOf(\MongoDB\Model\BSONDocument::class, $fileDocument);
+        $this->assertInstanceOf(BSONDocument::class, $fileDocument);
     }
 
     public function testFindOne()
@@ -344,7 +361,7 @@ class BucketFunctionalTest extends FunctionalTestCase
             ]
         );
 
-        $this->assertInstanceOf(\MongoDB\Model\BSONDocument::class, $fileDocument);
+        $this->assertInstanceOf(BSONDocument::class, $fileDocument);
         $this->assertSameDocument(['filename' => 'b', 'length' => 6], $fileDocument);
     }
 
@@ -364,7 +381,7 @@ class BucketFunctionalTest extends FunctionalTestCase
     {
         $chunksCollection = $this->bucket->getChunksCollection();
 
-        $this->assertInstanceOf(\MongoDB\Collection::class, $chunksCollection);
+        $this->assertInstanceOf(Collection::class, $chunksCollection);
         $this->assertEquals('fs.chunks', $chunksCollection->getCollectionName());
     }
 
@@ -392,8 +409,8 @@ class BucketFunctionalTest extends FunctionalTestCase
 
         $fileDocument = $this->bucket->getFileDocumentForStream($stream);
 
-        $this->assertInstanceOf(\MongoDB\Model\BSONDocument::class, $fileDocument);
-        $this->assertInstanceOf(\MongoDB\Model\BSONDocument::class, $fileDocument['metadata']);
+        $this->assertInstanceOf(BSONDocument::class, $fileDocument);
+        $this->assertInstanceOf(BSONDocument::class, $fileDocument['metadata']);
         $this->assertSame(['foo' => 'bar'], $fileDocument['metadata']->getArrayCopy());
     }
 
@@ -443,7 +460,7 @@ class BucketFunctionalTest extends FunctionalTestCase
 
         $id = $this->bucket->getFileIdForStream($stream);
 
-        $this->assertInstanceOf(\MongoDB\Model\BSONDocument::class, $id);
+        $this->assertInstanceOf(BSONDocument::class, $id);
         $this->assertSame(['x' => 1], $id->getArrayCopy());
     }
 
@@ -475,7 +492,7 @@ class BucketFunctionalTest extends FunctionalTestCase
     {
         $filesCollection = $this->bucket->getFilesCollection();
 
-        $this->assertInstanceOf(\MongoDB\Collection::class, $filesCollection);
+        $this->assertInstanceOf(Collection::class, $filesCollection);
         $this->assertEquals('fs.files', $filesCollection->getCollectionName());
     }
 
@@ -675,7 +692,7 @@ class BucketFunctionalTest extends FunctionalTestCase
         $this->bucket->uploadFromStream('filename', $this->createStream('foo'));
 
         $this->assertIndexExists($this->filesCollection->getCollectionName(), 'filename_1_uploadDate_1');
-        $this->assertIndexExists($this->chunksCollection->getCollectionName(), 'files_id_1_n_1', function(IndexInfo $info) {
+        $this->assertIndexExists($this->chunksCollection->getCollectionName(), 'files_id_1_n_1', function (IndexInfo $info) {
             $this->assertTrue($info->isUnique());
         });
     }

tests/GridFS/FunctionalTestCase.php

@@ -6,6 +6,11 @@ use MongoDB\Collection;
 use MongoDB\GridFS\Bucket;
 use MongoDB\Tests\FunctionalTestCase as BaseFunctionalTestCase;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
+use function fopen;
+use function fwrite;
+use function get_resource_type;
+use function rewind;
+use function stream_get_contents;
 
 /**
  * Base class for GridFS functional tests.

tests/GridFS/ReadableStreamFunctionalTest.php

@@ -5,11 +5,11 @@ namespace MongoDB\Tests\GridFS;
 use MongoDB\BSON\Binary;
 use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\GridFS\CollectionWrapper;
-use MongoDB\GridFS\ReadableStream;
 use MongoDB\GridFS\Exception\CorruptFileException;
+use MongoDB\GridFS\ReadableStream;
 use MongoDB\Tests\CommandObserver;
-use stdClass;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
+use function array_filter;
 
 /**
  * Functional tests for the internal ReadableStream class.
@@ -119,8 +119,9 @@ class ReadableStreamFunctionalTest extends FunctionalTestCase
 
     public function provideFilteredFileIdAndExpectedBytes()
     {
-        return array_filter($this->provideFileIdAndExpectedBytes(),
-            function(array $args) {
+        return array_filter(
+            $this->provideFileIdAndExpectedBytes(),
+            function (array $args) {
                 return $args[1] > 0;
             }
         );
@@ -219,12 +220,12 @@ class ReadableStreamFunctionalTest extends FunctionalTestCase
 
         $commands = [];
 
-        (new CommandObserver)->observe(
-            function() use ($stream, $offset, $length, $expectedBytes) {
+        (new CommandObserver())->observe(
+            function () use ($stream, $offset, $length, $expectedBytes) {
                 $stream->seek($offset);
                 $this->assertSame($expectedBytes, $stream->readBytes($length));
             },
-            function(array $event) use (&$commands) {
+            function (array $event) use (&$commands) {
                 $commands[] = $event['started']->getCommandName();
             }
         );
@@ -255,12 +256,12 @@ class ReadableStreamFunctionalTest extends FunctionalTestCase
 
         $commands = [];
 
-        (new CommandObserver)->observe(
-            function() use ($stream, $offset, $length, $expectedBytes) {
+        (new CommandObserver())->observe(
+            function () use ($stream, $offset, $length, $expectedBytes) {
                 $stream->seek($offset);
                 $this->assertSame($expectedBytes, $stream->readBytes($length));
             },
-            function(array $event) use (&$commands) {
+            function (array $event) use (&$commands) {
                 $commands[] = $event['started']->getCommandName();
             }
         );
@@ -289,12 +290,12 @@ class ReadableStreamFunctionalTest extends FunctionalTestCase
 
         $commands = [];
 
-        (new CommandObserver)->observe(
-            function() use ($stream, $offset, $length, $expectedBytes) {
+        (new CommandObserver())->observe(
+            function () use ($stream, $offset, $length, $expectedBytes) {
                 $stream->seek($offset);
                 $this->assertSame($expectedBytes, $stream->readBytes($length));
             },
-            function(array $event) use (&$commands) {
+            function (array $event) use (&$commands) {
                 $commands[] = $event['started']->getCommandName();
             }
         );

tests/GridFS/StreamWrapperFunctionalTest.php

@@ -5,6 +5,15 @@ namespace MongoDB\Tests\GridFS;
 use MongoDB\BSON\Binary;
 use MongoDB\BSON\UTCDateTime;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
+use function fclose;
+use function feof;
+use function fread;
+use function fseek;
+use function fstat;
+use function fwrite;
+use const SEEK_CUR;
+use const SEEK_END;
+use const SEEK_SET;
 
 /**
  * Functional tests for the internal StreamWrapper class.
@@ -57,26 +66,26 @@ class StreamWrapperFunctionalTest extends FunctionalTestCase
     {
         $stream = $this->bucket->openDownloadStream('length-10');
 
-        $this->assertSame(0, fseek($stream, 2, \SEEK_SET));
+        $this->assertSame(0, fseek($stream, 2, SEEK_SET));
         $this->assertSame('cde', fread($stream, 3));
-        $this->assertSame(0, fseek($stream, 10, \SEEK_SET));
+        $this->assertSame(0, fseek($stream, 10, SEEK_SET));
         $this->assertSame('', fread($stream, 3));
-        $this->assertSame(-1, fseek($stream, -1, \SEEK_SET));
-        $this->assertSame(-1, fseek($stream, 11, \SEEK_SET));
+        $this->assertSame(-1, fseek($stream, -1, SEEK_SET));
+        $this->assertSame(-1, fseek($stream, 11, SEEK_SET));
 
-        $this->assertSame(0, fseek($stream, -5, \SEEK_CUR));
+        $this->assertSame(0, fseek($stream, -5, SEEK_CUR));
         $this->assertSame('fgh', fread($stream, 3));
-        $this->assertSame(0, fseek($stream, 1, \SEEK_CUR));
+        $this->assertSame(0, fseek($stream, 1, SEEK_CUR));
         $this->assertSame('j', fread($stream, 3));
-        $this->assertSame(-1, fseek($stream, 1, \SEEK_CUR));
-        $this->assertSame(-1, fseek($stream, -11, \SEEK_CUR));
+        $this->assertSame(-1, fseek($stream, 1, SEEK_CUR));
+        $this->assertSame(-1, fseek($stream, -11, SEEK_CUR));
 
-        $this->assertSame(0, fseek($stream, 0, \SEEK_END));
+        $this->assertSame(0, fseek($stream, 0, SEEK_END));
         $this->assertSame('', fread($stream, 3));
-        $this->assertSame(0, fseek($stream, -8, \SEEK_END));
+        $this->assertSame(0, fseek($stream, -8, SEEK_END));
         $this->assertSame('cde', fread($stream, 3));
-        $this->assertSame(-1, fseek($stream, -11, \SEEK_END));
-        $this->assertSame(-1, fseek($stream, 1, \SEEK_END));
+        $this->assertSame(-1, fseek($stream, -11, SEEK_END));
+        $this->assertSame(-1, fseek($stream, 1, SEEK_END));
     }
 
     public function testReadableStreamStat()
@@ -137,17 +146,17 @@ class StreamWrapperFunctionalTest extends FunctionalTestCase
 
         $this->assertSame(6, fwrite($stream, 'foobar'));
 
-        $this->assertSame(-1, fseek($stream, 0, \SEEK_SET));
-        $this->assertSame(-1, fseek($stream, 7, \SEEK_SET));
-        $this->assertSame(0, fseek($stream, 6, \SEEK_SET));
+        $this->assertSame(-1, fseek($stream, 0, SEEK_SET));
+        $this->assertSame(-1, fseek($stream, 7, SEEK_SET));
+        $this->assertSame(0, fseek($stream, 6, SEEK_SET));
 
-        $this->assertSame(0, fseek($stream, 0, \SEEK_CUR));
-        $this->assertSame(-1, fseek($stream, -1, \SEEK_CUR));
-        $this->assertSame(-1, fseek($stream, 1, \SEEK_CUR));
+        $this->assertSame(0, fseek($stream, 0, SEEK_CUR));
+        $this->assertSame(-1, fseek($stream, -1, SEEK_CUR));
+        $this->assertSame(-1, fseek($stream, 1, SEEK_CUR));
 
-        $this->assertSame(0, fseek($stream, 0, \SEEK_END));
-        $this->assertSame(-1, fseek($stream, -1, \SEEK_END));
-        $this->assertSame(-1, fseek($stream, 1, \SEEK_END));
+        $this->assertSame(0, fseek($stream, 0, SEEK_END));
+        $this->assertSame(-1, fseek($stream, -1, SEEK_END));
+        $this->assertSame(-1, fseek($stream, 1, SEEK_END));
     }
 
     public function testWritableStreamStatBeforeSaving()
@@ -171,7 +180,7 @@ class StreamWrapperFunctionalTest extends FunctionalTestCase
         $stat = fstat($stream);
         $this->assertSame(6, $stat[7]);
         $this->assertSame(6, $stat['size']);
-  }
+    }
 
     public function testWritableStreamStatAfterSaving()
     {

tests/GridFS/WritableStreamFunctionalTest.php

@@ -6,6 +6,7 @@ use MongoDB\Exception\InvalidArgumentException;
 use MongoDB\GridFS\CollectionWrapper;
 use MongoDB\GridFS\WritableStream;
 use Symfony\Bridge\PhpUnit\SetUpTearDownTrait;
+use function str_repeat;
 
 /**
  * Functional tests for the internal WritableStream class.

tests/Model/CachingIteratorTest.php

@@ -2,9 +2,10 @@
 
 namespace MongoDB\Tests\Model;
 
+use Exception;
 use MongoDB\Model\CachingIterator;
 use MongoDB\Tests\TestCase;
-use Exception;
+use function iterator_to_array;
 
 class CachingIteratorTest extends TestCase
 {
@@ -52,7 +53,7 @@ class CachingIteratorTest extends TestCase
 
     public function testPartialIterationDoesNotExhaust()
     {
-        $traversable = $this->getTraversableThatThrows([1, 2, new Exception]);
+        $traversable = $this->getTraversableThatThrows([1, 2, new Exception()]);
         $iterator = new CachingIterator($traversable);
 
         $expectedKey = 0;

tests/Model/CollectionInfoTest.php

@@ -64,7 +64,7 @@ class CollectionInfoTest extends TestCase
     {
         $info = new CollectionInfo(['name' => 'foo', 'options' => ['capped' => true, 'size' => 1048576]]);
         $this->expectException(BadMethodCallException::class);
-        $this->expectExceptionMessage(CollectionInfo::class .' is immutable');
+        $this->expectExceptionMessage(CollectionInfo::class . ' is immutable');
         $info['options'] = ['capped' => false];
     }
 
@@ -72,7 +72,7 @@ class CollectionInfoTest extends TestCase
     {
         $info = new CollectionInfo(['name' => 'foo', 'options' => ['capped' => true, 'size' => 1048576]]);
         $this->expectException(BadMethodCallException::class);
-        $this->expectExceptionMessage(CollectionInfo::class .' is immutable');
+        $this->expectExceptionMessage(CollectionInfo::class . ' is immutable');
         unset($info['options']);
     }
 }

tests/Model/DatabaseInfoTest.php

@@ -53,7 +53,7 @@ class DatabaseInfoTest extends TestCase
     {
         $info = new DatabaseInfo(['name' => 'foo', 'sizeOnDisk' => 1048576, 'empty' => false]);
         $this->expectException(BadMethodCallException::class);
-        $this->expectExceptionMessage(DatabaseInfo::class .' is immutable');
+        $this->expectExceptionMessage(DatabaseInfo::class . ' is immutable');
         $info['empty'] = true;
     }
 
@@ -61,7 +61,7 @@ class DatabaseInfoTest extends TestCase
     {
         $info = new DatabaseInfo(['name' => 'foo', 'sizeOnDisk' => 1048576, 'empty' => false]);
         $this->expectException(BadMethodCallException::class);
-        $this->expectExceptionMessage(DatabaseInfo::class .' is immutable');
+        $this->expectExceptionMessage(DatabaseInfo::class . ' is immutable');
         unset($info['empty']);
     }
 }