Weakref::__construct

(PECL weakref >= 0.1.0)

Weakref::__construct — Constructs a new weak reference

Descrizione

public Weakref::__construct ([ object $object ] )

Constructs a new weak reference.

Elenco dei parametri

object: The object to reference.

Valori restituiti

Nessun valore viene restituito.

Esempi

Example #1 Weakref::__construct() 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";
}
?>

Il precedente esempio visualizzerà:

Object still exists!
object(MyClass)#1 (0) {
}
Destroying object!
Object is dead!