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Mention the service tag of env processors #10553

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Oct 26, 2018
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Mention the service tag of env processors #10553

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9 changes: 7 additions & 2 deletions configuration/external_parameters.rst
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Expand Up @@ -471,8 +471,7 @@ Custom Environment Variable Processors

It's also possible to add your own processors for environment variables. First,
create a class that implements
:class:`Symfony\\Component\\DependencyInjection\\EnvVarProcessorInterface` and
then, define a service for that class::
:class:`Symfony\\Component\\DependencyInjection\\EnvVarProcessorInterface`::

use Symfony\Component\DependencyInjection\EnvVarProcessorInterface;

Expand All @@ -493,6 +492,12 @@ then, define a service for that class::
}
}

To enable the new processor in the app, register it as a service and
:doc:`tag it </service_container/tags>` with the ``container.env_var_processor``
tag. If you're using the
:ref:`default services.yaml configuration <service-container-services-load-example>`,
this is already done for you, thanks to :ref:`autoconfiguration <services-autoconfigure>`.

Constants
---------

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