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Add section about anonymous services #9909

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36 changes: 36 additions & 0 deletions service_container/alias_private.rst
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Expand Up @@ -129,6 +129,42 @@ This means that when using the container directly, you can access the
# ...
app.mailer: '@app.phpmailer'

Anonymous Services
--------------------

.. note::

Anonymous services are currently only supported by the XML configuration format.

In some cases, you may want to limit access to a service outside of its
intended scope. This is useful when you want to prevent other services from
using the service as their own dependency. This can be achieved by creating an
*anonymous service*.

For Symfony, an anonymous service is nothing more than a service without a
identifying name which is defined directly in its use context. The following
example shows how an anonymous service can be injected into another service:

.. configuration-block::
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we don't need the configuration-block here when we only have one config format


.. code-block:: xml

<!-- app/config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services
http://symfony.com/schema/dic/services/services-1.0.xsd">

<services>
<service id="foo" class="AppBundle\Foo">
<argument type="service">
<service class="AppBundle\AnonymousBar" />
</argument>
</service>
</services>
</container>

Deprecating Services
--------------------

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