private function __CreateOauthUrlForCode($redirectUrl)
{
$urlObj["appid"] = WxPayConfig::APPID;
$urlObj["redirect_uri"] = "{$redirectUrl}";
$urlObj["response_type"] = "code";
$urlObj["scope"] = "snsapi_base";
$urlObj["state"] = "STATE" . "#wechat_redirect";
$bizString = $this->ToUrlParams($urlObj);
return "https://open.weixin.qq.com/connect/oauth2/authorize?" . $bizString;
}