Класс SplObjectStorage

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

Введение

Класс SplObjectStorage предоставляет отображение объектов в данные или набор объектов, игнорируя данные. Эта двойная цель может быть полезна во многих случаях, включая необходимость уникальной идентификации объектов.

Обзор классов

class SplObjectStorage implements Countable, Iterator, Serializable, ArrayAccess {

/* Методы */

public addAll(SplObjectStorage $storage): int

public attach(object $object, mixed $info = null): void

public contains(object $object): bool

public count(int $mode = COUNT_NORMAL): int

public current(): object

public detach(object $object): void

public getHash(object $object): string

public getInfo(): mixed

public key(): int

public next(): void

public offsetExists(object $object): bool

public offsetGet(object $object): mixed

public offsetSet(object $object, mixed $info = null): void

public offsetUnset(object $object): void

public removeAll(SplObjectStorage $storage): int

public removeAllExcept(SplObjectStorage $storage): int

public rewind(): void

public serialize(): string

public setInfo(mixed $info): void

public unserialize(string $data): void

public valid(): bool

}

Примеры

Пример #1 Класс SplObjectStorage как набор объектов

<?php
// Набор объектов
$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));
?>

Результат выполнения приведённого примера:

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

Пример #2 Класс SplObjectStorage как отображение объектов в данные

<?php
// Как отображение объектов к данным
$s = new SplObjectStorage();

$o1 = new stdClass;
$o2 = new stdClass;
$o3 = new stdClass;

$s[$o1] = "данные для объекта 1";
$s[$o2] = array(1,2,3);

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

Результат выполнения приведённого примера:

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

Содержание

SplObjectStorage::addAll — Добавляет все объекты из другого контейнера
SplObjectStorage::attach — Добавляет объект в контейнер
SplObjectStorage::contains — Проверяет, содержит ли контейнер заданный объект
SplObjectStorage::count — Возвращает количество объектов в контейнере
SplObjectStorage::current — Возвращает текущий объект
SplObjectStorage::detach — Удаляет объект object из контейнера
SplObjectStorage::getHash — Вычисляет уникальный идентификатор для объектов контейнера
SplObjectStorage::getInfo — Возвращает данные, ассоциированные с текущим объектом
SplObjectStorage::key — Возвращает индекс текущего положения итератора
SplObjectStorage::next — Переход к следующему объекту
SplObjectStorage::offsetExists — Проверяет, существует ли объект в контейнере
SplObjectStorage::offsetGet — Возвращает данные, ассоциированные с объектом object
SplObjectStorage::offsetSet — Ассоциирует данные с объектом в контейнере
SplObjectStorage::offsetUnset — Удаляет объект из контейнера
SplObjectStorage::removeAll — Удаляет из текущего контейнера объекты, которые есть в другом контейнере
SplObjectStorage::removeAllExcept — Удаляет из текущего контейнера все объекты, которых нет в другом контейнере
SplObjectStorage::rewind — Переводит итератор на первый элемент контейнера
SplObjectStorage::serialize — Сериализует контейнер
SplObjectStorage::setInfo — Ассоциирует данные с текущим объектом контейнера
SplObjectStorage::unserialize — Восстанавливает сериализованый контейнер из строки
SplObjectStorage::valid — Определяет, допустимо ли текущее значение итератора

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User Contributed Notes 12 notes

down

Adam Monsen ¶

10 years ago


Note some inconsistent/surprising behavior in SplObjectStorage to preserve backwards compatibility. You can't properly use foreach with key/value syntax.

<?php
$spl = new SplObjectStorage ();
$keyForA = new StdClass();
$keyForB = new StdClass();
$spl[$keyForA] = 'value a';
$spl[$keyForB] = 'value b';
foreach ($spl as $key => $value)
{
    // $key is NOT an object, $value is!
    // Must use standard array access to get strings.
    echo $spl[$value] . "\n"; // prints "value a", then "value b"
}
// it may be clearer to use this form of foreach:
foreach ($spl as $key)
{
    // $key is an object.
    // Use standard array access to get values.
    echo $spl[$key] . "\n"; // prints "value a", then "value b"
}
?>

See https://bugs.php.net/bug.php?id=49967

down

rafal at pawlukiewicz dot com ¶

5 years ago


SplObjectStorage class can be nicely used in Observer pattern, for example:

<?php
class Subject implements \SplSubject
{
    private $observers;
    
    public function __construct()
    {
        $this->observers = new \SplObjectStorage;
    }

    public function attach(\SplObserver $observer)
    {
        $this->observers->attach($observer);
    }

    public function detach(\SplObserver $observer)
    {
        $this->observers->detach($observer);
    }

    public function notify()
    {
        foreach ($this->observers as $observer) {
            $observer->update($this);
        }
    }
}
?>

down

frame86 at live dot com ¶

8 years ago


Keep in mind that foreach() will copy your array before iterating, SplObjectStorage does not. If you have a sub call within an iteration that also calls foreach() on the object storage again, the iterator position collides!

To be safe use:
<?php
foreach(clone $myStorage as $obj) {

}
?>

down

m dot drewek at smf dot de ¶

9 years ago


Please note that SplObjectStorage has a Bug introduced with 5.4.0, breaking object lookup in cloned instances of derived classes that overwrite getHash().

This is a confirmed Bug: https://bugs.php.net/bug.php?id=67582

Example:
<?php
class MyObjectStorage extends SplObjectStorage {
    // Overwrite getHash() with just some (working) test-method
    public function getHash($object) { return get_class($object); }
}

class TestObject {}

$list = new MyObjectStorage(); // No issues if using "new SplObjectStorage()"
$list->attach(new TestObject());

foreach($list as $x) var_dump($list->offsetExists($x)); // TRUE

$list2 = clone $list;
foreach($list2 as $x) var_dump($list2->offsetExists($x)); // FALSE
?>

down

grzeniufication ¶

7 years ago


<?php
/**
  * For simple use cases (where you want to keep objects in a map)
  * I would suggest to stick to an plain old array. Just use the object
  * hash as array key.
  */
$entity1 = new stdClass();
$entity2 = new stdClass();
$entities = [];
$entities[spl_object_hash($entity1)] = $entity1;
$entities[spl_object_hash($entity2)] = $entity2;

// object hashes are hard to distinguish so you could run a hash function
// on them for better readability.
$entities[md5(spl_object_hash($entity1))] = $entity1;
$entities[md5(spl_object_hash($entity2))] = $entity2;

print_r($entities);

down

kris dot lamote at it-kitchen dot be ¶

9 years ago


For anyone having issues with SplObjectStorages containing corrupt member variables after garbage collection (FatalErrorException after serializing): we used following fix to great effect
<?php

class FixedSplObjectStorage extends SplObjectStorage
{

    public function serialize()
    {
        $goodPortion = 'N;;m:a:0:{}';
        $startKey = 'N;;m:a:';

        $serialized = parent::serialize();

        $startPos = strpos($serialized, $startKey);

        if ($startPos !== false) {
            $serialized = substr_replace($serialized, $goodPortion, $startPos, -1);

        }

        return $serialized;

    }
}

?>

down

inwebo at gmail dot fr ¶

12 years ago


I needed to merge SplObjectStorages.
<?php
// As an object set
$SplObjectStorage_1 = new SplObjectStorage();

$object1 = new StdClass;
$object1->attr = 'obj 1';
$object2 = new StdClass;
$object2->attr = 'obj 2';
$object3 = new StdClass;
$object3->attr = 'obj 3';

$SplObjectStorage_1->attach($object1);
$SplObjectStorage_1->attach($object2);
$SplObjectStorage_1->attach($object3);

// Another one object set
$SplObjectStorage_2 = new SplObjectStorage();

$object4 = new StdClass;
$object4->attr = 'obj 4';
$object5 = new StdClass;
$object5->attr = 'obj 5';
$object6 = new StdClass;
$object6->attr = 'obj 6';

$SplObjectStorage_2->attach($object4);
$SplObjectStorage_2->attach($object5);
$SplObjectStorage_2->attach($object6);

/**
 * Merge SplObjectStorage
 *
 * @param how many SplObjectStorage params as you want
 * @return SplObjectStorage
 */
function mergeSplObjectStorage() {
    
    $buffer   = new SplObjectStorage();

    if( func_num_args() > 0  ) {
        $args = func_get_args();
        foreach ($args as $objectStorage) {
            foreach($objectStorage as $object) {
                if(is_object( $object ) ) {
                    $buffer->attach($object);
                }
            }
        }
    }
    else{
        return FALSE;
    }
    return $buffer;
}

$merge = mergeSplObjectStorage($SplObjectStorage_1, $SplObjectStorage_2);

?>
<?php
echo $merge->count();
?>
Will output :
6

<?php
$merge->rewind();
while($merge->valid()) {
    $object = $merge->current();
    var_dump($object);
    $merge->next();
}
?>
Will ouput :
object(stdClass)#2 (1) {
  ["attr"]=>
  string(5) "obj 1"
}
object(stdClass)#3 (1) {
  ["attr"]=>
  string(5) "obj 2"
}
object(stdClass)#4 (1) {
  ["attr"]=>
  string(5) "obj 3"
}
object(stdClass)#6 (1) {
  ["attr"]=>
  string(5) "obj 4"
}
object(stdClass)#7 (1) {
  ["attr"]=>
  string(5) "obj 5"
}
object(stdClass)#8 (1) {
  ["attr"]=>
  string(5) "obj 6"
}

My two cents.

down

divinity76 at gmail dot com ¶

7 years ago


if you're looking for a ResourceStorage, check https://gist.github.com/divinity76/b8041e073b74bdeab562a075fc94217f

(i needed it for socket programming with socket_select())

down

Marius ¶

10 years ago


Do not use SplObjectStorage::detach when forach'ing over items in the storage as this skips the second (and only second) element.

Example:

<?php

class A {
    public $i;
    public function __construct($i) {
        $this->i = $i;
    }
}

$container = new \SplObjectStorage();

$container->attach(new A(1));
$container->attach(new A(2));
$container->attach(new A(3));
$container->attach(new A(4));
$container->attach(new A(5));

foreach ($container as $item) {
    echo $item->i . "\n";
    $container->detach($item);
}
echo "== Left in storage ==\n";
foreach ($container as $item) {
    echo $item->i . "\n";
}
/* Outputs:
1
3
4
5
== Left in storage ==
2
*/
?>

down

jan at odvarko dot cz ¶

3 years ago


If you assign an array() to an object in SplObjectStorage and then try to modify its individual elements, you'll probably find it doesn't work.
Instead, you can use ArrayObject(), which will emulate array behaviour.

<?php

$storage = new SplObjectStorage();

$obj1 = new StdClass();
$obj2 = new StdClass();

$storage[$obj1] = array();
$storage[$obj2] = new ArrayObject();

$storage[$obj1]['person'] = 'Jana'; // Won't work  (PHP Notice:  Indirect modification of overloaded element of SplObjectStorage has no effect)
$storage[$obj2]['person'] = 'Jana'; // Works

var_dump($storage[$obj1]['person']); // NULL  (PHP Notice:  Undefined index: person)
var_dump($storage[$obj2]['person']); // string(4) "Jana"

?>

down

Jan Walther ¶

13 years ago


I rewrote some scripts and changed object storage with arrays to SplObjectStorage. At some point I needed support of array_rand() but I did not find a function to return a random attached object of an SplObjectStorage object.



So here is my solution for random access to SplObjectStorage:



<?php

$o1 = new StdClass;

$o2 = new StdClass;

$s = new SplObjectStorage;

$s->attach($o1);

$s->attach($o2);



$random = rand(0,$s->count()-1);

$s->rewind();

for($i=0;$i<$random;$i++) {

  $s->next();

}

var_dump($s->current());

?>

down

-9

randallgirard at hotmail dot com ¶

14 years ago


I have two things to note about SplObjectStorage:

#1: A reference to the object itself is stored (not just a hash to compare against the object) and it must be removed before the object is destroyed and the destructor is executed.

#2: SplObjectStorage::rewind() MUST be called to initiate the iterator and before SplObjectStorage::current() will return an object (and I think the only way to retrieve an object?) rather than automatically starting at the first element as I expected it to, like an array for example. This assumption is based on SplObjectStorage::current() returning NULL until SplObjectStorage::rewind() is called once the objects are contained. As a note, always use REWIND before iterating through or fetching objects.

<?php

class foo {
    public function __destruct() {
        print("--- DESTRUCTOR FIRED!!<br />\r\n");
    }
}

# Create object and storage
$bar = new foo();
$s = new SplObjectStorage();

# Rewind early just as a test
$s->rewind();

# attach the object
$s->attach($bar, array('test'));

# Unset the object; destructor does NOT fire
unset($bar);
print("Object has been unset<br />\r\n");

# First demonstrate that REWIND must be called to initialize the iterator
$obj = $s->current();
var_dump($obj);
print("- Note the NULL (from \$s->current())<br />\r\n");

# Initialize, and then detach the current (and only) object
$s->rewind();
$s->detach( $s->current() );

# The destructor should NOW execute

?>

Output:

Object has been unset
NULL - Note the NULL (from $s->current())
--- DESTRUCTOR FIRED!!

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