public function defines() {
        $defines = get_defined_constants();
        $ret = array(); $offset = -1;
        while ($def = array_slice($defines, $offset--, 1)) {
            $key = key($def);
            $value = current($def);
            if ($key  == 'FIRST_APP_CONSTANT') break;
            $ret[$key ] = $value;
        }
        return $ret;
    }