There is SplFixedArray http://www.php.net/manual/en/class.splfixedarray.php http://www.php.net/manual/en/class.splfixedarray.php, not sure if this is the one he

There is SplFixedArray http://www.php.net/manual/en/class.splfixedarray.php http://www.php.net/manual/en/class.splfixedarray.php, not sure if this is the one he mentioned though.