class MyClass { public function eventHandler() { echo "Handling event..."; } } $obj = new MyClass(); $obj->setEventController('eventHandler');In this example, we create a MyClass object and then set its event controller to the eventHandler function. Whenever an event is raised on this object, the eventHandler function will be called to handle it. Package/Library: This function is part of the core PHP language and does not require any external library or package.