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    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

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    User Contributed Notes 2 notes

    up
    42
    lsroudi at gmail dot com
    12 years ago
    the SplStack is  simply a SplDoublyLinkedList with  an iteration mode IT_MODE_LIFO and IT_MODE_KEEP
    up
    8
    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();
}
?>

Output
5
4
3
2
1
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