1. 8.3.x core/core.api.php service_tag
  2. 8.0.x core/core.api.php service_tag
  3. 8.1.x core/core.api.php service_tag
  4. 8.2.x core/core.api.php service_tag
  5. 8.4.x core/core.api.php service_tag

Service tags overview

Some services have tags, which are defined in the service definition. Tags are used to define a group of related services, or to specify some aspect of how the service behaves. Typically, if you tag a service, your service class must also implement a corresponding interface. Some common examples:

Creating a tag for a service does not do anything on its own, but tags can be discovered or queried in a compiler pass when the container is built, and a corresponding action can be taken. See \Drupal\Core\Render\MainContent\MainContentRenderersPass for an example of finding tagged services.

See Services and Dependency Injection Container for information on services and the dependency injection container.

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core/core.api.php, line 2461
Documentation landing page and topics, plus core library hooks.