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

public function SplDoublyLinkedList::bottom(): mixed

public function SplDoublyLinkedList::count(): int

public function SplDoublyLinkedList::current(): mixed

public function SplDoublyLinkedList::getIteratorMode(): int

public function SplDoublyLinkedList::isEmpty(): bool

public function SplDoublyLinkedList::key(): int

public function SplDoublyLinkedList::next(): void

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

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

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

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

public function SplDoublyLinkedList::pop(): mixed

public function SplDoublyLinkedList::prev(): void

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

public function SplDoublyLinkedList::rewind(): void

public function SplDoublyLinkedList::serialize(): string

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

public function SplDoublyLinkedList::shift(): mixed

public function SplDoublyLinkedList::top(): mixed

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

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

public function 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