PHP 7.0.6 Released

    The WeakRef class

    (PECL weakref >= 0.1.0)

    Introduction

    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.

    Class synopsis

    WeakRef {
    /* Methods */
    public Weakref::__construct ( object $object )
    public bool Weakref::acquire ( void )
    public object Weakref::get ( void )
    public bool Weakref::release ( void )
    public bool Weakref::valid ( void )
    }

    Examples

    Example #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";
    }
    ?>

    The above example will output:

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

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