The SplObjectStorage class
Guide
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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.
Intro
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.
Class synopsis
class SplObjectStorage implements Countable implements SeekableIterator implements Serializable implements ArrayAccess { }
Examples
SplObjectStorage as a set
php
<?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));
?>The above example will output:
output
bool(true)
bool(true)
bool(false)
bool(true)
bool(false)
bool(false)SplObjectStorage as a map
php
<?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]);
}
?>The above example will output:
output
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}Changelog
| Version | Description |
|---|---|
| 8.4.0 | Implement SeekableIterator, previously only Iterator was implemented. |
Splobjectstorage