If the queue is empty, dequeue() will raise an 'RuntimeException' with message 'Can't shift from an empty datastructure'.
(PHP 5 >= 5.3.0, PHP 7, PHP 8)
SplQueue::dequeue — Supprime un nœud de la file d'attente
Supprime la valeur value du haut de la
file d'attente.
Note:
SplQueue::dequeue() est un alias de SplDoublyLinkedList::shift().
Cette fonction ne contient aucun paramètre.
La valeur du nœud supprimé.
If the queue is empty, dequeue() will raise an 'RuntimeException' with message 'Can't shift from an empty datastructure'.I just thought this was a fun and interesting way for lining up method calls and then calling them back-to-back. Might be useful as a basis for a transactional execution class or something.<?php$q = new SplQueue();$q->setIteratorMode(SplQueue::IT_MODE_DELETE);$q->enqueue(array("FooBar", "foo"));$q->enqueue(array("FooBar", "bar"));$q->enqueue(array("FooBar", "msg", "Hi there!"));foreach ($q as $task) { if (count($task) > 2) { list($class, $method, $args) = $task; $class::$method($args); } else { list($class, $method) = $task; $class::$method(); }}class FooBar { public static function foo() { echo "FooBar::foo() called.\n"; } public static function bar() { echo "FooBar::bar() called.\n"; } public static function msg($msg) { echo "$msg\n"; }}?>Results:FooBar::foo() called.FooBar::bar() called.Hi there!<?php$q = new SplQueue();$q->setIteratorMode(SplQueue::IT_MODE_DELETE);$q->enqueue('item 1');$q->enqueue('item 2');$q->enqueue('item 3');$q->dequeue();$q->dequeue();foreach ($q as $item) { echo $item;}//Result: item 3$q->dequeue(); //Fatal error: Uncaught exception 'RuntimeException' //with message 'Can't shift from an empty datastructure'?>I just thought this was a fun and interesting way for lining up method calls and then calling them back-to-back. Might be useful as a basis for a transactional execution class or something.<?php$q = new SplQueue();$q->setIteratorMode(SplQueue::IT_MODE_DELETE);$q->enqueue(array("FooBar", "foo"));$q->enqueue(array("FooBar", "bar"));$q->enqueue(array("FooBar", "msg", "Hi there!"));foreach ($q as $task) { if (count($task) > 2) { list($class, $method, $args) = $task; $class::$method($args); } else { list($class, $method) = $task; $class::$method(); }}class FooBar { public static function foo() { echo "FooBar::foo() called.\n"; } public static function bar() { echo "FooBar::bar() called.\n"; } public static function msg($msg) { echo "$msg\n"; }}?>Results:FooBar::foo() called.FooBar::bar() called.Hi there!