The WeakRef class
(PECL weakref >= 0.1.0)
Einführung
The WeakRef class provides a gateway to objects without preventing the garbage collector from freeing those objects. It also provides a way to turn a weak reference into a strong one.
Hinweis:
The class WeakRef is not to be confused with the class WeakReference.
Klassenbeschreibung
WeakRef
{
/* Methoden */
}Beispiele
Beispiel #1 WeakRef usage example
<?php
class MyClass {
public function __destruct() {
echo "Destroying object!\n";
}
}
$o1 = new MyClass;
$r1 = new WeakRef($o1);
if ($r1->valid()) {
echo "Object still exists!\n";
var_dump($r1->get());
} else {
echo "Object is dead!\n";
}
unset($o1);
if ($r1->valid()) {
echo "Object still exists!\n";
var_dump($r1->get());
} else {
echo "Object is dead!\n";
}
?>
Das oben gezeigte Beispiel erzeugt folgende Ausgabe:
Object still exists!
object(MyClass)#1 (0) {
}
Destroying object!
Object is dead!
Inhaltsverzeichnis
- Weakref::acquire — Acquires a strong reference on that object
- Weakref::__construct — Constructs a new weak reference
- Weakref::get — Returns the object pointed to by the weak reference
- Weakref::release — Releases a previously acquired reference
- Weakref::valid — Checks whether the object referenced still exists
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