<?php

use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\GenericEvent as 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(new Event(), 'callme');


^ 3

Call me too
Call me

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PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8