PHP手工生成每个字节都要生成十六进制urlencode字符串()

  $param2 = self::iconv_array('UTF-8','UCS-2', $param);
        // 生成urlencode字符串，每个字节都要生成十六进制，用http_build_query()或urlencode()不行，下面手工处理// 开始
        $param2_arr = array();
        foreach ($param2 as $k => $v)
        {
            $len = strlen($v);
            $str = '';
            for ($i = 0; $i < $len; $i++)
            {
                $str .= sprintf("%%%02X", ord(substr($v, $i, 1)));
            }
            $param2_arr[] = $k . '=' . $str;
        }
        $param2str = implode("&", $param2_arr);
        // 结束