The SplObjectStorage class

(PHP 5 >= 5.3.0, PHP 7)

简介

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.

类摘要

SplObjectStorage implements Countable , Iterator , Serializable , ArrayAccess {

/* 方法 */

public addAll ( SplObjectStorage $storage ) : void

public attach ( object $object [, mixed $data = NULL ] ) : void

public contains ( object $object ) : bool

public count ( void ) : int

public current ( void ) : object

public detach ( object $object ) : void

public getHash ( object $object ) : string

public getInfo ( void ) : mixed

public key ( void ) : int

public next ( void ) : void

public offsetExists ( object $object ) : bool

public offsetGet ( object $object ) : mixed

public offsetSet ( object $object [, mixed $data = NULL ] ) : void

public offsetUnset ( object $object ) : void

public removeAll ( SplObjectStorage $storage ) : void

public removeAllExcept ( SplObjectStorage $storage ) : void

public rewind ( void ) : void

public serialize ( void ) : string

public setInfo ( mixed $data ) : void

public unserialize ( string $serialized ) : void

public valid ( void ) : bool

}

范例

Example #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));
?>

以上例程会输出：

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

Example #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]);
}
?>

以上例程会输出：

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

SplObjectStorage::addAll — Adds all objects from another storage
SplObjectStorage::attach — Adds an object in the storage
SplObjectStorage::contains — Checks if the storage contains a specific object
SplObjectStorage::count — Returns the number of objects in the storage
SplObjectStorage::current — Returns the current storage entry
SplObjectStorage::detach — Removes an object from the storage
SplObjectStorage::getHash — Calculate a unique identifier for the contained objects
SplObjectStorage::getInfo — Returns the data associated with the current iterator entry
SplObjectStorage::key — Returns the index at which the iterator currently is
SplObjectStorage::next — Move to the next entry
SplObjectStorage::offsetExists — Checks whether an object exists in the storage
SplObjectStorage::offsetGet — Returns the data associated with an object
SplObjectStorage::offsetSet — Associates data to an object in the storage
SplObjectStorage::offsetUnset — Removes an object from the storage
SplObjectStorage::removeAll — Removes objects contained in another storage from the current storage
SplObjectStorage::removeAllExcept — Removes all objects except for those contained in another storage from the current storage
SplObjectStorage::rewind — Rewind the iterator to the first storage element
SplObjectStorage::serialize — Serializes the storage
SplObjectStorage::setInfo — Sets the data associated with the current iterator entry
SplObjectStorage::unserialize — Unserializes a storage from its string representation
SplObjectStorage::valid — Returns if the current iterator entry is valid

The SplObjectStorage class

简介

类摘要

范例

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