The SplQueue class

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    Introduction

    The SplQueue class provides the main functionalities of a queue implemented using a doubly linked list by setting the iterator mode to SplDoublyLinkedList::IT_MODE_FIFO.

    Examples

    Example #1 SplQueue example

    <?php
    $q     = new SplQueue();
    $q[] = 1;
    $q[] = 2;
    $q[] = 3;
    foreach (    $q as $elem) {
    echo     $elem."\n";
    }
    ?>

    The above example will output:

     1 2 3

    Example #2 Efficiently handling tasks with SplQueue

    <?php
    $q     = new SplQueue();
    $q->setIteratorMode(SplQueue::IT_MODE_DELETE);
    // ... enqueue some tasks on the queue ...
    // process them
    foreach ($q as $task) {
    // ... process $task ...

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