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19 changes: 19 additions & 0 deletions service_container/tags.rst
Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,25 @@ then some tags are automatically applied for you. That's true for the ``twig.ext
tag: the container sees that your class extends ``Twig_Extension`` (or more accurately,
that it implements ``Twig_ExtensionInterface``) and adds the tag for you.

.. tip::

To apply a tag to all your autoconfigured services extending a class or an
interface, call :method:`Symfony\\Component\\DependencyInjection\\ContainerBuilder::registerForAutoconfiguration`
method in an :doc:`extension </bundles/extension>` or from your kernel::

// app/AppKernel.php
class AppKernel extends Kernel
{
// ...

protected function build(ContainerBuilder $container)
{
$container->registerForAutoconfiguration(CustomInterface::class)
->addTag('app.custom_tag')
;
}
}

Creating custom Tags
--------------------

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