Datastructures
PHP Manual

The SplObjectStorage class

(PHP 5 >= 5.3.0)

Introdução

The SplObjectStorage class provides a map from objects to data or, by ignoring data, an object set. This dual purpose can be useful in many cases involving the need to uniquely identify objects.

Sinopse da classe

SplObjectStorage implements Countable , Iterator , Traversable , Serializable , ArrayAccess {
/* Métodos */
public void addAll ( SplObjectStorage $storage )
public void attach ( object $object [, mixed $data = NULL ] )
public bool contains ( object $object )
public int count ( void )
public object current ( void )
public void detach ( object $object )
public string getHash ( object $object )
public mixed getInfo ( void )
public int key ( void )
public void next ( void )
public bool offsetExists ( object $object )
public mixed offsetGet ( object $object )
public void offsetSet ( object $object [, mixed $data = NULL ] )
public void offsetUnset ( object $object )
public void removeAll ( SplObjectStorage $storage )
public void removeAllExcept ( SplObjectStorage $storage )
public void rewind ( void )
public string serialize ( void )
public void setInfo ( mixed $data )
public void unserialize ( string $serialized )
public bool valid ( void )
}

Exemplos

Exemplo #1 SplObjectStorage as a set

<?php
// As an object set
$s = new SplObjectStorage();

$o1 = new StdClass;
$o2 = new StdClass;
$o3 = new StdClass;

$s->attach($o1);
$s->attach($o2);

var_dump($s->contains($o1));
var_dump($s->contains($o2));
var_dump($s->contains($o3));

$s->detach($o2);

var_dump($s->contains($o1));
var_dump($s->contains($o2));
var_dump($s->contains($o3));
?>

O exemplo acima irá imprimir:

bool(true)
bool(true)
bool(false)
bool(true)
bool(false)
bool(false)

Exemplo #2 SplObjectStorage as a map

<?php
// As a map from objects to data
$s = new SplObjectStorage();

$o1 = new StdClass;
$o2 = new StdClass;
$o3 = new StdClass;

$s[$o1] = "data for object 1";
$s[$o2] = array(1,2,3);

if (isset($s[$o2])) {
    var_dump($s[$o2]);
}
?>

O exemplo acima irá imprimir:

array(3) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
}

Índice

Datastructures
PHP Manual