weakreference
ENTITY
Weak references allow the programmer to retain a reference to an object without preventing the object from being destroyed. They are useful for implementing cache-like structures. If the original object has been destroyed, ENTITY will be returned when calling the WeakReference::get method. The original object will be destroyed when the refcount for it drops to zero; creating weak references does not increase the refcount of the object being referenced.
WeakReferences cannot be serialized.
ENTITY
final
WeakReference
ENTITY
WeakReference Examples
Basic WeakReference Usage
<?php
$obj = new stdClass();
$weakref = WeakReference::create($obj);
var_dump($weakref->get());
unset($obj);
var_dump($weakref->get());
?>
ENTITY
object(stdClass)#1 (0) {
}
NULL
ENTITY
| ENTITY | ENTITY |
|---|---|
| 8.4.0 | The output of WeakReference::__debugInfo now includes the referenced object, or ENTITY if the reference is no longer valid. |
ENTITY ENTITY ENTITY
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