A classe SplStack

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

Introdução

A classe SplStack fornece as principais funcionalidades de uma pilha implementada usando uma lista duplamente encadeada definindo o modo do iterador como SplDoublyLinkedList::IT_MODE_LIFO.

Resumo da classe

class SplStack extends SplDoublyLinkedList {

/* Constantes herdadas */

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;

/* Métodos herdados */

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

}

Exemplos

Exemplo #1 Exemplo de SplStack

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

O exemplo acima produzirá:

3
2
1

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Notas Enviadas por Usuários (em inglês) 2 notes

down

lsroudi at gmail dot com ¶

10 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 ¶

7 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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