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 to SplDoublyLinkedList::IT_MODE_LIFO.

Class synopsis

class SplStack extends SplDoublyLinkedList {

/* Inherited constants */

public const int SplDoublyLinkedList::IT_MODE_LIFO;

public const int SplDoublyLinkedList::IT_MODE_FIFO;

public const int SplDoublyLinkedList::IT_MODE_DELETE;

public const int SplDoublyLinkedList::IT_MODE_KEEP;

/* Inherited methods */

public SplDoublyLinkedList::add(int $index, mixed $value): void

public SplDoublyLinkedList::bottom(): mixed

public SplDoublyLinkedList::count(): int

public SplDoublyLinkedList::current(): mixed

public SplDoublyLinkedList::getIteratorMode(): int

public SplDoublyLinkedList::isEmpty(): bool

public SplDoublyLinkedList::key(): int

public SplDoublyLinkedList::next(): void

public SplDoublyLinkedList::offsetExists(int $index): bool

public SplDoublyLinkedList::offsetGet(int $index): mixed

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

public SplDoublyLinkedList::offsetUnset(int $index): void

public SplDoublyLinkedList::pop(): mixed

public SplDoublyLinkedList::prev(): void

public SplDoublyLinkedList::push(mixed $value): void

public SplDoublyLinkedList::rewind(): void

public SplDoublyLinkedList::serialize(): string

public SplDoublyLinkedList::setIteratorMode(int $mode): int

public SplDoublyLinkedList::shift(): mixed

public SplDoublyLinkedList::top(): mixed

public SplDoublyLinkedList::unserialize(string $data): void

public SplDoublyLinkedList::unshift(mixed $value): void

public SplDoublyLinkedList::valid(): bool

}

Examples

Example #1 SplStack example

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

The above example will output:

3
2
1

Found A Problem?

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 2 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

down

lincoln dot du dot j at gmail dot com ¶

8 years ago

<?php//SplStack Mode is LIFO (Last In First Out)  $q = new SplStack();$q[] = 1;$q[] = 2;$q[] = 3;$q->push(4);$q->add(4,5);$q->rewind();while($q->valid()){    echo $q->current(),"\n";    $q->next();}?>Output54321

＋add a note