PHP: Hypertext Preprocessor (original) (raw)

SplQueue::dequeue

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

SplQueue::dequeue — Dequeues a node from the queue

Parameters

This function has no parameters.

Return Values

The value of the dequeued node.

Found A Problem?

xuecan at gmail dot com ¶

15 years ago

If the queue is empty, dequeue() will raise an 'RuntimeException' with message 'Can't shift from an empty datastructure'.

mark at bull-roarer dot com ¶

11 years ago

`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.

q−>setIteratorMode(SplQueue::ITMODEDELETE);q->setIteratorMode(SplQueue::IT_MODE_DELETE);q−>setIteratorMode(SplQueue::ITMODEDELETE);q->enqueue(array("FooBar", "foo")); $q->enqueue(array("FooBar", "bar")); $q->enqueue(array("FooBar", "msg", "Hi there!")); foreach ( qasq as qastask) { if (count($task) > 2) { list($class, method,method, method,args) = task;<spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>:</mo><mo>:</mo></mrow><annotationencoding="application/x−tex">class::</annotation></semantics></math><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.6944em;"><spanclass="mordmathnormal">c<spanclass="mordmathnormal"style="margin−right:0.01968em;">l<spanclass="mordmathnormal">a<spanclass="mordmathnormal">ss<spanclass="mspace"style="margin−right:0.2778em;"><spanclass="mrel">::method(task; <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>:</mo><mo>:</mo></mrow><annotation encoding="application/x-tex">class::</annotation></semantics></math>class::method(task;<spanclass="katex"><spanclass="katex−mathml"><mathxmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>c</mi><mi>l</mi><mi>a</mi><mi>s</mi><mi>s</mi><mo>:</mo><mo>:</mo></mrow><annotationencoding="application/x−tex">class::</annotation></semantics></math><spanclass="katex−html"aria−hidden="true"><spanclass="base"><spanclass="strut"style="height:0.6944em;"><spanclass="mordmathnormal">c<spanclass="mordmathnormal"style="margin−right:0.01968em;">l<spanclass="mordmathnormal">a<spanclass="mordmathnormal">ss<spanclass="mspace"style="margin−right:0.2778em;"><spanclass="mrel">::method(args); } else { list($class, method)=method) = method)=task; class::class::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!

andresdzphp at php dot net ¶

13 years ago

`<?php
$q = new SplQueue();
$q->setIteratorMode(SplQueue::IT_MODE_DELETE);
$q->enqueue('item 1');
$q->enqueue('item 2'); q−>enqueue(′item3′);q->enqueue('item 3');q−>enqueue(′item3′);q->dequeue();
$q->dequeue();

foreach ( qasq as qasitem) {
echo $item;
}//Result: item 3$q->dequeue(); //Fatal error: Uncaught exception 'RuntimeException'
//with message 'Can't shift from an empty datastructure'
?>`

mark at bull-roarer dot com ¶

11 years ago

`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.

Results:
FooBar::foo() called.
FooBar::bar() called.
Hi there!