Php/docs/class.weakreference
From Get docs
(PHP 7 >= 7.4.0)
Introduction
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.
Note:
The class WeakReference is not to be confused with the class WeakRef of the Weakref extension.
WeakReferences cannot be serialized.
Class synopsis
WeakReference {
public __construct ( )
public static create
( object $referent
) : WeakReference
public get ( ) : object|null
}
WeakReference Examples
Example #1 Basic WeakReference Usage
<?php$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
/* Methods */