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

.. default-domain:: mongodb

.. contents:: On this page
   :local:
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   :class: singlecol

Definition
----------

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

   Returns information for all databases on the server.

   .. code-block:: php

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

   This method has the following parameters:

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

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

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

Return Values
-------------

A traversable :phpclass:`MongoDB\\Model\\DatabaseInfoIterator`, which contains
a :phpclass:`MongoDB\\Model\\DatabaseInfo` object for each database on the
server.

Errors/Exceptions
-----------------

.. include:: /includes/extracts/error-unexpectedvalueexception.rst
.. include:: /includes/extracts/error-invalidargumentexception.rst
.. include:: /includes/extracts/error-driver-runtimeexception.rst

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 output would then resemble::

   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)
   }

See Also
--------

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