<?php

// SplPriorityQueue is more like a heap
$queue = new SplPriorityQueue();

$queue->insert('second', 2);
$queue->insert('third', 1);
$queue->insert('first', 3);

foreach ($queue as $element) {
    // returns value by default
    echo $element . PHP_EOL;
}

echo 'count: ' . count($queue);

first
second
third
count: 0

• PHP's own queue class: SplQueue
• Influence var_dump output of an object in PHP
• PHP Serializable interface

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8