============================
MongoDB\\Database::command()
============================

.. default-domain:: mongodb

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Definition
----------

.. phpmethod:: MongoDB\\Database::command()

   Execute a :manual:`command </reference/command>` on the database.

   .. code-block:: php

      function command($command, array $options = []): MongoDB\Driver\Cursor

   This method has the following parameters:

   .. include:: /includes/apiargs/MongoDBDatabase-method-command-param.rst

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

   .. include:: /includes/apiargs/MongoDBDatabase-method-command-option.rst

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

A :php:`MongoDB\\Driver\\Cursor <class.mongodb-driver-cursor>` object.

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

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

Example
-------

The following example executes an :manual:`isMaster
</reference/command/isMaster>` command, which returns a cursor with a single
result document:

.. code-block:: php

   <?php

   $database = (new MongoDB\Client)->test;

   $cursor = $database->command(['isMaster' => 1]);

   var_dump($c->toArray()[0]);

The output would resemble::

   object(MongoDB\Model\BSONDocument)#11 (1) {
     ["storage":"ArrayObject":private]=>
     array(8) {
       ["ismaster"]=>
       bool(true)
       ["maxBsonObjectSize"]=>
       int(16777216)
       ["maxMessageSizeBytes"]=>
       int(48000000)
       ["maxWriteBatchSize"]=>
       int(1000)
       ["localTime"]=>
       object(MongoDB\BSON\UTCDateTime)#3 (1) {
         ["milliseconds"]=>
         string(13) "1477608046464"
       }
       ["maxWireVersion"]=>
       int(4)
       ["minWireVersion"]=>
       int(0)
       ["ok"]=>
       float(1)
     }
   }

The following example executes a :manual:`listCollections
</reference/command/listCollections>` command, which returns a cursor with
multiple result documents:

.. code-block:: php

   <?php

   $database = (new MongoDB\Client)->test;

   $cursor = $database->command(['isMaster' => 1]);

   var_dump($c->toArray());

The output would resemble::

   array(3) {
     [0]=>
     object(MongoDB\Model\BSONDocument)#11 (1) {
       ["storage":"ArrayObject":private]=>
       array(2) {
         ["name"]=>
         string(11) "restaurants"
         ["options"]=>
         object(MongoDB\Model\BSONDocument)#3 (1) {
           ["storage":"ArrayObject":private]=>
           array(0) {
           }
         }
       }
     }
     [1]=>
     object(MongoDB\Model\BSONDocument)#13 (1) {
       ["storage":"ArrayObject":private]=>
       array(2) {
         ["name"]=>
         string(5) "users"
         ["options"]=>
         object(MongoDB\Model\BSONDocument)#12 (1) {
           ["storage":"ArrayObject":private]=>
           array(0) {
           }
         }
       }
     }
     [2]=>
     object(MongoDB\Model\BSONDocument)#15 (1) {
       ["storage":"ArrayObject":private]=>
       array(2) {
         ["name"]=>
         string(6) "restos"
         ["options"]=>
         object(MongoDB\Model\BSONDocument)#14 (1) {
           ["storage":"ArrayObject":private]=>
           array(0) {
           }
         }
       }
     }
   }

See Also
--------

- :doc:`/tutorial/commands`
- :manual:`Database Commands </reference/command>` in the MongoDB manual
- :php:`MongoDB\\Driver\\Cursor <class.mongodb-driver-cursor>`
- :php:`MongoDB\\Driver\\Manager::executeCommand()
  <manual/en/mongodb-driver-manager.executecommand.php>`