================================
MongoDB\\Client::listDatabases()
================================

.. default-domain:: mongodb

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Definition
----------

.. phpmethod:: MongoDB\\Client::listDatabases($options)

   Lists the available databases.

   .. code-block:: php

      function listDatabases(array $options = []): MongoDB\Model\DatabaseInfoIterator

   :phpmethod:`MongoDB\\Client::listDatabases` has the following parameters:

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

   ``listDatabases`` supports the following values for the ``$options`` array:

   .. include:: /includes/apiargs/MongoDBClient-method-listDatabases-option.rst

Output
------

Information for all databases on the :program:`mongod`, replica set,
or sharded cluster to which you are connected. The returned elements are
``MongoDB\Model\DatabaseInfo`` objects.

Example
-------

The following example lists all databases on the server:

.. code-block:: php

   <?php

   $client = new MongoDB\Client;

   foreach ($client->listDatabases() as $databaseInfo) {
       var_dump($databaseInfo);
   }

The above example would output something similar to:

.. code-block:: php

   object(MongoDB\Model\DatabaseInfo)#4 (3) {
     ["name"]=>
     string(5) "local"
     ["sizeOnDisk"]=>
     float(65536)
     ["empty"]=>
     bool(false)
   }
   object(MongoDB\Model\DatabaseInfo)#7 (3) {
     ["name"]=>
     string(4) "test"
     ["sizeOnDisk"]=>
     float(32768)
     ["empty"]=>
     bool(false)
   }

.. seealso::

   :manual:`listDatabases() command reference in the MongoDB
   manual </reference/command/listDatabases>`