public static function hidePart($p_string, $p_replace = 'X', $p_left = 4, $p_right = 4)
    {
        $len = strlen($p_string);
        $str = substr($p_string, 0, $p_left) .
            str_pad('', $len - $p_left - $p_right, $p_replace) .
            substr($p_string, $len - $p_right);
        return $str;
    }