SplFixedArray::__wakeup
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.
La classe SplObjectStorage
(PHP 5 >= 5.3.0)
Introduction
La classe SplObjectStorage fournit une carte d'objets ou de données, ou encore, en ignorant les index, un ensemble d'objets. Ce double objectif est utile dans de nombreuses situations, où il faut identifier de manière unique des objets.
Synopsis de la classe
/* Méthodes */
}Exemples
Exemple #1 Exemple avec SplObjectStorage, sous forme d'ensemble d'objets
<?php
// Un ensemble d'objets
$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));
?>
L'exemple ci-dessus va afficher :
bool(true) bool(true) bool(false) bool(true) bool(false) bool(false)
Exemple #2 Exemple avec SplObjectStorage, sous forme de carte
<?php
// Une carte d'objets
$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]);
}
?>
L'exemple ci-dessus va afficher :
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
Sommaire
- SplObjectStorage::addAll — Ajoute tous les objets d'un autre stockage
- SplObjectStorage::attach — Ajoute un objet dans le stockage
- SplObjectStorage::contains — Vérifie si un stockage contient un objet
- SplObjectStorage::count — Retourne le nombre d'objets dans le stockage
- SplObjectStorage::current — Retourne l'objet courant
- SplObjectStorage::detach — Retire un objet du stockage
- SplObjectStorage::getHash — Calcule un identifiant unique pour les objets contenus
- SplObjectStorage::getInfo — Retourne les données associés à l'élément en cours
- SplObjectStorage::key — Retourne l'index de l'objet courant
- SplObjectStorage::next — Passe au prochain élément
- SplObjectStorage::offsetExists — Vérifie si un objet existe dans le stockage
- SplObjectStorage::offsetGet — Retourne les données associées à un objet
- SplObjectStorage::offsetSet — Associe des données à un stockage
- SplObjectStorage::offsetUnset — Retire un objet du stockage
- SplObjectStorage::removeAll — Retire les objets d'un stockage qui appartienne à un autre stockage
- SplObjectStorage::removeAllExcept — Supprime tous les objets du stockage courant sauf ceux contenus dans d'autres stockages
- SplObjectStorage::rewind — Remet l'itérateur au début
- SplObjectStorage::serialize — Linéarise un stockage
- SplObjectStorage::setInfo — Modifie les données associée à l'élément courant
- SplObjectStorage::unserialize — Délinéarise un stockage à partir de sa forme en chaîne
- SplObjectStorage::valid — Vérifie si l'élément courant est valide
add a note
User Contributed Notes
SplObjectStorage - [5 notes]
inwebo at gmail dot fr ¶
1 year ago
Jan Walther ¶
1 year 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());
?>
Robertas at pobox com ¶
3 years ago
PHP 5.2.x and lower doesn't implement ArrayAccess in SplObjectStorage - it is only implemented starting from PHP 5.3
randallgirard at hotmail dot com ¶
3 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!!
Hayley Watson ¶
1 year ago
As an iterator, SplObjectStorage traverses the _keys_ of the map (the $o1, $o2 of Example 2) rather than the values. To retrieve each of those in turn requires an additional lookup:
<?php
// As a map from objects to data
$s = new SplObjectStorage();
$o1 = (object)array('a'=>1);
$o2 = (object)array('b'=>2);
$o3 = (object)array('c'=>3);
$s[$o1] = "data for object 1";
$s[$o2] = array(1,2,3);
foreach($s as $i => $key)
{
echo "Entry $i:\n"; // You get a numeric index
var_dump($key, $s[$key]);
echo "\n";
}
?>
This makes sense when you use an SplObjectStorage as a set, since in that case all of the "values" are null.