(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.
Example #1 Basic WeakReference Usage
<?php
$obj = new stdClass;
$weakref = WeakReference::create($obj);
var_dump($weakref->get());
unset($obj);
var_dump($weakref->get());
?>Il precedente esempio visualizzerà qualcosa simile a:
object(stdClass)#1 (0) {
}
NULL