Class Based Listeners
Class based listeners allow for a nicer and clean listener management. The Emitter
accepts listeners which implement the ListenerInterface. This interface require two
methods to be defined; isListener and handle. Because many listeners will have the
same implementation of isListener the AbstractListener implements this for you.
Implementing the ListenerInterface
<?php
use League\Event\ListenerInterface;
use League\Event\EventInterface;
class DomainListener implements ListenerInterface
{
public function isListener($listener)
{
return $listener === $this;
}
public function handle(EventInterface $event)
{
// Handle the event.
}
}
$emitter->addListener('event.name', new DomainListener);
Extending the AbstractListener
use League\Event\AbstractListener;
use League\Event\EventInterface;
class DomainListener extends AbstractListener
{
public function handle(EventInterface $event)
{
// Handle the event.
}
}