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