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PHP Manual [The WeakMap class]

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PHP Manual || Weakref

(PECL weakref >= 0.2.0)

WeakMap implements Countable , ArrayAccess , Iterator {
/* Methods */
public __construct ( void )
public count ( void ) : int
public current ( void ) : mixed
public key ( void ) : object
public next ( void ) : 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 ) : void
public valid ( void ) : bool
}

Example #1 Weakmap usage example

<?php
$wm 
= new WeakMap();

$o = new StdClass;

class 
{
    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)



PHP Manual || Weakref