#. The event name (string) that this listener wants to listen to;

#. A PHP callable that will be executed when the specified event is dispatched;

#. An optional priority integer that determines when a listener is triggered

versus other listeners (defaults to ``0``). A higher priority integer means

the listener will be triggered earlier. So, priority 3 executes before

priority 2. Priority 2 executes before priority 1. Priority 1 executes before

priority 0, and so on. If two listeners have the same priority, they are

executed in the order that they were added to the dispatcher.

#. An optional priority, defined as a positive or negative integer (defaults to

``0``). The higher the priority, the earlier the listener is called. If two

listeners have the same priority, they are executed in the order that they

were added to the dispatcher.

..note::