$url = $this->app->url();
//modify By Symo.chan 自动判断http或https 如果没有协议头则加入协议头
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https" : "http";
if (!preg_match("/^(http|https):/", $url)){
$url = $protocol .':'. $url;
}
更新库表中原来上传的图片，把http:// 替换成 // 相对链接地址
update iot_fof_upload_files set url = replace(url,'http:','');
