<?php

$list = new SplDoublyLinkedList();

// adding elements with push or unshift
$list->push(1);
$list->push(10);
$list->push(100);

$list->setIteratorMode(SplDoublyLinkedList::IT_MODE_FIFO);
loop($list);

$list->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO
| SplDoublyLinkedList::IT_MODE_DELETE);
loop($list);

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

function loop(Traversable $list) {
    foreach ($list as $element) {
        echo $element . PHP_EOL;
    }
}

1
10
100
100
10
1
count: 0

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