The SplStack class

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

Introduction

The SplStack class provides the main functionalities of a stack implemented using a doubly linked list by setting the iterator mode toSplDoublyLinkedList::IT_MODE_LIFO.

Class synopsis

classSplStackextendsSplDoublyLinkedList {

/* Inherited constants */

publicconstintSplDoublyLinkedList::IT_MODE_LIFO;

publicconstintSplDoublyLinkedList::IT_MODE_FIFO;

publicconstintSplDoublyLinkedList::IT_MODE_DELETE;

publicconstintSplDoublyLinkedList::IT_MODE_KEEP;

/* Inherited methods */

publicSplDoublyLinkedList::add(int$index,mixed$value):void

publicSplDoublyLinkedList::bottom():mixed

publicSplDoublyLinkedList::count():int

publicSplDoublyLinkedList::current():mixed

publicSplDoublyLinkedList::getIteratorMode():int

publicSplDoublyLinkedList::isEmpty():bool

publicSplDoublyLinkedList::key():int

publicSplDoublyLinkedList::next():void

publicSplDoublyLinkedList::offsetExists(int$index):bool

publicSplDoublyLinkedList::offsetGet(int$index):mixed

publicSplDoublyLinkedList::offsetSet(?int$index,mixed$value):void

publicSplDoublyLinkedList::offsetUnset(int$index):void

publicSplDoublyLinkedList::pop():mixed

publicSplDoublyLinkedList::prev():void

publicSplDoublyLinkedList::push(mixed$value):void

publicSplDoublyLinkedList::rewind():void

publicSplDoublyLinkedList::serialize():string

publicSplDoublyLinkedList::setIteratorMode(int$mode):int

publicSplDoublyLinkedList::shift():mixed

publicSplDoublyLinkedList::top():mixed

publicSplDoublyLinkedList::unserialize(string$data):void

publicSplDoublyLinkedList::unshift(mixed$value):void

publicSplDoublyLinkedList::valid():bool

}

Examples

Example #1SplStack example

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

The above example will output:

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User Contributed Notes2 notes

down

lsroudi at gmail dot com ¶

11 years ago

the SplStack is  simply a SplDoublyLinkedList with  an iteration mode IT_MODE_LIFO and IT_MODE_KEEP