Whups_Query::_getParameterName PHP Method

    protected function _getParameterName($value)
    {
        if (strcmp(substr($value, 0, 2), '${')) {
            return null;
        }
        $pn = substr($value, 2, -1);
        if (!is_string($pn)) {
            $pn = null;
        }
        return $pn;
    }