function ContainerAwareEventDispatcher::hasListeners

File

core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php, line 197

Class

ContainerAwareEventDispatcher

A performance optimized container aware event dispatcher.

Namespace

Code

public function hasListeners($event_name = NULL) : bool {
    if ($event_name !== NULL) {
        return !empty($this->listeners[$event_name]);
    }
    foreach ($this->listeners as $event_listeners) {
        if ($event_listeners) {
            return TRUE;
        }
    }
    return FALSE;
}