<?php

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

// event listeners
$eventListener1 = function (Event $event) {
    echo 'Call me' . PHP_EOL;
};

$eventListener2 = function (Event $event) {
    echo 'Call me too' . PHP_EOL;
};

// add listeners to EventDispatcher
$dispatcher = new EventDispatcher();
$dispatcher->addListener('callme', $eventListener1, 2);
$dispatcher->addListener('callme', $eventListener2, 3);

// priority of "callme" event
dump($dispatcher->getListenerPriority('callme', $eventListener2));

$dispatcher->dispatch('callme', new Event());


3

Call me too
Call me

• OptionResolver for valid and complete option values
• JsonResponse - Symfony has a lot of different Response classes
• Using Symfony validator with annotations

PHP 7.2, Zend 3.0, Symfony 4.0, Laravel 5.6, PHPUnit 6.5, Doctrine 2.8