==============================
MongoDB\\Client::__construct()
==============================

.. default-domain:: mongodb

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Definition
----------

.. phpmethod:: MongoDB\\Client::__construct()

   Constructs a new :phpclass:`Client <MongoDB\\Client>` instance.

   .. code-block:: php

      function __construct($uri = 'mongodb://127.0.0.1/', array $uriOptions = [], array $driverOptions = [])

   This constructor has the following parameters:

   .. include:: /includes/apiargs/MongoDBClient-method-construct-param.rst

   The ``$driverOptions`` parameter supports the following options:

   .. include:: /includes/apiargs/MongoDBClient-method-construct-driverOptions.rst

Examples
--------

If you do not specify a ``$uri`` value, the driver connects to a standalone
:program:`mongod` on ``127.0.0.1`` via port ``27017``. The following example
demonstrates how to connect to a replica set with a custom read preference:

.. code-block:: php

   <?php

   $client = new MongoDB\Client(
       'mongodb://rs1.example.com,rs2.example.com/?replicaSet=myReplicaSet',
       [
           'readPreference' => 'secondaryPreferred',
       ]
   );

By default, the |php-library| deserializes BSON documents and arrays
as :phpclass:`MongoDB\\Model\\BSONDocument` and
:phpclass:`MongoDB\\Model\\BSONArray` objects, respectively. The following
example demonstrates how to have the library unserialize everything as a PHP
array, as was done in the legacy :php:`mongo extension <mongo>`.

.. code-block:: php

   <?php

   $client = new MongoDB\Client(
       null,
       [],
       [
           'typeMap' => [
               'root' => 'array',
               'document' => 'array',
               'array' => 'array',
           ],
       ]
   );

See Also
--------

- :php:`MongoDB\\Driver\\Manager::__construct()
  <mongodb-driver-manager.construct>`