Statement on glibc/iconv Vulnerability

    The WeakReference class

    (PHP 7 >= 7.4.0, PHP 8)

    Introduzione

    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.

    Sommario della classe

    final class WeakReference {
    /* Metodi */
    public __construct()
    public static create(object $object): WeakReference
    public get(): ?object
    }

    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());
    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

    object(stdClass)#1 (0) {
}
NULL

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