class UserLoginEvent implements Event
{
    public $userId;
}

class UserListener implements Listener
{
    /**
     * Acts on UserLoginEvent or it's descendants
     */
    public function onUserLogin(UserLoginEvent $event)
    {
        echo "User listener 1";
    }

    /**
     * Act on any event
     */
    public function onAnyEvent(Event $event)
    {
        echo "User listener 2";
    }
}

$manager = new EventManager();
$manager->add(new UserListener());
$manager->emit(new UserLoginEvent($user));