The WeakReference class
Introduction
(PHP 7 >= 7.4.0, PHP 8)
Weak references allow the programmer to retain a reference to an object which does not prevent the object from being destroyed. They are useful for implementing cache like structures.
WeakReferences cannot be serialized.
Class synopsis
final class WeakReference {
/* Methods */
public
__construct()
public static create(object $object): WeakReference
public get(): ?object}
WeakReference Examples
Example #1 Basic WeakReference Usage
<?php $obj = new stdClass; $weakref = WeakReference::create($obj); var_dump($weakref->get()); unset($obj); var_dump($weakref->get()); ?>
The above example will output something similar to:
object(stdClass)#1 (0) {
}
NULL
Table of Contents
- WeakReference::__construct — Constructor that disallows instantiation
- WeakReference::create — Create a new weak reference
- WeakReference::get — Get a weakly referenced Object
© 1997–2021 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/class.weakreference.php
