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The WeakMap class

Introduction

(PECL weakref >= 0.2.0)

Class synopsis

WeakMap implements Countable , ArrayAccess , Iterator {
/* Methods */
public __construct ( )
public count ( ) : int
public current ( ) : mixed
public key ( ) : object
public next ( ) : void
public offsetExists ( object $object ) : bool
public offsetGet ( object $object ) : mixed
public offsetSet ( object $object , mixed $value ) : void
public offsetUnset ( object $object ) : void
public rewind ( ) : void
public valid ( ) : bool
}

Examples

Example #1 Weakmap usage example

<?php
$wm = new WeakMap();

$o = new StdClass;

class A {
    public function __destruct() {
        echo "Dead!\n";
    }
}

$wm[$o] = new A;

var_dump(count($wm));
echo "Unsetting..\n";
unset($o);
echo "Done\n";
var_dump(count($wm));

The above example will output:

int(1)
Unsetting..
Dead!
Done
int(0)

Table of Contents

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https://www.php.net/manual/en/class.weakmap.php