Checks whether an event has any registered listeners.
Parameters
string $eventName The name of the event:
Return value
Boolean true if the specified event has any listeners, false otherwise
File
- drupal/core/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/EventDispatcherInterface.php, line 95
Class
- EventDispatcherInterface
- The EventDispatcherInterface is the central point of Symfony's event listener system.
Listeners are registered on the manager and events are dispatched through the
manager.
Namespace
Symfony\Component\EventDispatcher
Code
public function hasListeners($eventName = null);