Symfony Event Dispatcher

eventdispatcher.php

require_once __DIR__ . '/../vendor/autoload.php';

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\Event;

$dispatcher = new EventDispatcher();
$dispatcher->addListener('event_name', function(Event $event) {
    echo $event->getName(), ' Done', "\n";
});
$dispatcher->dispatch('event_name');
$dispatcher->dispatch('event_name');

$dispatcher->addListener('event_name_2', function(Event $event) {
    echo $event->getName(), ' Done', "\n";
});
$dispatcher->dispatch('event_name_2');