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(PECL weakref >= 0.2.0)
Examples:
Weakmap usage example
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<?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)