Event_Dispatcher pear.php.net Event BSD License Dispatch notifications using PHP callbacks The Event_Dispatcher acts as a notification dispatch table. It is used to notify other objects of interesting things. This information is encapsulated in Event_Notification objects. Client objects register themselves with the Event_Dispatcher as observers of specific notifications posted by other objects. When an event occurs, an object posts an appropriate notification to the Event_Dispatcher. The Event_Dispatcher dispatches a message to each registered observer, passing the notification as the sole argument.

Event_SignalEmitter pear.php.net Event LGPL Generic signal emitting class with the same API as GObject. Generic signal emitting class with the same API as GObject. Since GObject doesn't allow classes to define or emit own signals, this class provides a PHP implementation with the same API.