public static function sort($comparefn)
{
$obj = jsrt::this();
$arr = js_array::toNativeArray($obj);
jsrt::$sortfn = $comparefn;
usort($arr, array("js_array", "sort_helper"));
jsrt::$sortfn = NULL;
$len = count($arr);
for ($i = 0; $i < $len; $i++) {
$obj->put($i, $arr[$i]);
}
$obj->put('length', js_int($len));
return $obj;
}
