PHP EventManager template class

EventManager

<?php
class EventManager
{
    public $listeners = [];

    public function register($eventName, $listener)
    {
        $this->listeners[$eventName][] = $listener;
    }

    public function fire($eventName, $data)
    {
        if (!empty($this->listeners[$eventName])) {
            foreach ($this->listeners[$eventName] as $listener) {
                call_user_func([$listener, $eventName], $data);
            }
        }
    }
}