PHP 5.4.36 Released

La clase SplQueue

(PHP 5 >= 5.3.0)

Introducción

la clase SplQueue proporciona las principales funcionalidades de una cola implementada mediante una lista doblemente enlazada.

Sinopsis de la Clase

SplQueue extends SplDoublyLinkedList implements Iterator , ArrayAccess , Countable {
/* Métodos */
__construct ( void )
mixed dequeue ( void )
void enqueue ( mixed $value )
void setIteratorMode ( int $mode )
/* Métodos heredados */
public void SplDoublyLinkedList::add ( mixed $index , mixed $newval )
public mixed SplDoublyLinkedList::bottom ( void )
public int SplDoublyLinkedList::count ( void )
public mixed SplDoublyLinkedList::current ( void )
public bool SplDoublyLinkedList::isEmpty ( void )
public mixed SplDoublyLinkedList::key ( void )
public void SplDoublyLinkedList::next ( void )
public mixed SplDoublyLinkedList::offsetGet ( mixed $index )
public void SplDoublyLinkedList::offsetSet ( mixed $index , mixed $newval )
public void SplDoublyLinkedList::offsetUnset ( mixed $index )
public mixed SplDoublyLinkedList::pop ( void )
public void SplDoublyLinkedList::prev ( void )
public void SplDoublyLinkedList::push ( mixed $value )
public void SplDoublyLinkedList::rewind ( void )
public string SplDoublyLinkedList::serialize ( void )
public void SplDoublyLinkedList::setIteratorMode ( int $mode )
public mixed SplDoublyLinkedList::shift ( void )
public mixed SplDoublyLinkedList::top ( void )
public void SplDoublyLinkedList::unserialize ( string $serialized )
public void SplDoublyLinkedList::unshift ( mixed $value )
public bool SplDoublyLinkedList::valid ( void )
}

Tabla de contenidos

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User Contributed Notes 1 note

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8
Manu Manjunath
10 months ago
SplQueue inherits from SplDoublyLinkedList. So, objects of SplQueue support methods push() and pop(). But please be advised that if you use push() and pop() methods on a SplQueue object, it behaves like a stack rather than a queue.

For example:

$q = new SplQueue();
$q->push(1);
$q->push(2);
$q->push(3);
$q->pop();
print_r($q);

Above code returns:

SplQueue Object
(
    [flags:SplDoublyLinkedList:private] => 4
    [dllist:SplDoublyLinkedList:private] => Array
        (
            [0] => 1
            [1] => 2
        )
)

Note that 3 got popped and *not* 1.

So, please make sure that you use only enqueue() and dequeue() methods on a SplQueue object and *not* push() and pop().
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