UpYun::sign PHP Method

sign() private method

连接签名方法
private sign ( $method, $uri, $date, $length )
$method 请求方式 {GET, POST, PUT, DELETE} return 签名字符串
    private function sign($method, $uri, $date, $length)
    {
        /*{{{*/
        //$uri = urlencode($uri);
        $sign = "{$method}&{$uri}&{$date}&{$length}&{$this->_password}";
        return 'UpYun ' . $this->_username . ':' . md5($sign);
    }