lithium\net\http\Request::_cookies PHP Method

    protected function _cookies()
    {
        $cookies = $this->cookies;
        $invalid = str_split(",; \\+\t\r\n\v\f");
        $replace = array_map('rawurlencode', $invalid);
        foreach ($cookies as $key => &$value) {
            if (!is_scalar($value)) {
                $message = "Non-scalar value cannot be rendered for cookie `{$key}`";
                throw new UnexpectedValueException($message);
            }
            $value = strtr($value, array_combine($invalid, $replace));
            $value = "{$key}={$value}";
        }
        return implode('; ', $cookies);
    }