NukeViet\Core\Request::decodeCookie PHP Method

    private function decodeCookie($string)
    {
        $result = '';
        $string = $this->base64Decode($string);
        $strlen = strlen($string);
        for ($i = 0; $i < $strlen; ++$i) {
            $char = substr($string, $i, 1);
            $keychar = substr($this->cookie_key, $i % 32 - 1, 1);
            $result .= chr(ord($char) - ord($keychar));
        }
        return $result;
    }