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================================
MongoDB\\Collection::aggregate()
================================
.. default-domain:: mongodb
.. contents:: On this page
:local:
:backlinks: none
:depth: 1
:class: singlecol
Definition
----------
.. phpmethod:: MongoDB\\Collection::aggregate()
Executes an :manual:`aggregation framework pipeline
</core/aggregation-pipeline>` operation on the collection.
.. code-block:: php
function aggregate(array $pipeline, array $options = []): Traversable
This method has the following parameters:
.. include:: /includes/apiargs/MongoDBCollection-method-aggregate-param.rst
The ``$options`` parameter supports the following options:
.. include:: /includes/apiargs/MongoDBCollection-method-aggregate-option.rst
Return Values
-------------
A :php:`MongoDB\\Driver\\Cursor <class.mongodb-driver-cursor>` or
:php:`ArrayIterator <arrayiterator>` object. In both cases, the return value
will be :php:`Traversable <traversable>`.
Errors/Exceptions
-----------------
.. include:: /includes/extracts/error-unexpectedvalueexception.rst
.. include:: /includes/extracts/error-unsupportedexception.rst
.. include:: /includes/extracts/error-invalidargumentexception.rst
.. include:: /includes/extracts/error-driver-runtimeexception.rst
.. _php-coll-agg-method-behavior:
Behavior
--------
:phpmethod:`MongoDB\\Collection::aggregate()`'s return value depends on the
MongoDB server version and whether the ``useCursor`` option is specified. If
``useCursor`` is ``true``, a :php:`MongoDB\\Driver\\Cursor
<class.mongodb-driver-cursor>` object is returned. If ``useCursor`` is
``false``, an :php:`ArrayIterator <arrayiterator>` is returned that wraps the
``result`` array from the command response document. In both cases, the return
value will be :php:`Traversable <traversable>`.
.. todo: add examples
See Also
--------
- :phpmethod:`MongoDB\\Database::aggregate()`
- :manual:`aggregate </reference/command/aggregate>` command reference in the
MongoDB manual
- :manual:`Aggregation Pipeline </core/aggregation-pipeline>` documentation in
the MongoDB Manual