[PHP] WeChat payment JsApi 40163 error

This article will share with you the WeChat payment JsApi 40163 error and solution code.
Error:
Undefined array index: openid.
After inspection, it was found that: WeChat payment authorization obtains openId {"errcode":40163,"errmsg":"code been used",}
The reason is: WeChat payment code can only be used once, and it will be repeated the second time This error occurs when using.
Solving related reference: https://www.e-learn.cn/content/php/1102683
I tried the method in the reference to no avail, so I rewrote it according to the reason:
After troubleshooting, the problem was found Appears in: GetOpenid method in
WxPay.JsApiPay.php, the source code is:

/**
 * 
 * 通过跳转获取用户的openid，跳转流程如下：
 * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
 * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
 * 
 * @return 用户的openid
 */
public function GetOpenid()
{

   //通过code获得openid
   if (!isset($_GET['code']) ){
      //触发微信返回code码
      $baseUrl = urlencode('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
      $url = $this->__CreateOauthUrlForCode($baseUrl);
      Header("Location: $url");
      exit();
   } else {
      //获取code码，以获取openid
       $code = $_GET['code'];
       $openid = $this->getOpenidFromMp($code);
    
       return $openid;
   }
}

The modified code is:

/**
 * 
 * 通过跳转获取用户的openid，跳转流程如下：
 * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
 * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
 * 
 * @return 用户的openid
 */
public function GetOpenid()
{

   //通过code获得openid
   if (!isset($_GET['code']) ){
      //触发微信返回code码
      $baseUrl = urlencode('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
      $url = $this->__CreateOauthUrlForCode($baseUrl);
      Header("Location: $url");
      exit();
   } else {
      //获取code码，以获取openid
       $code = $_GET['code'];
           if(session("?$code")){
               $openid = $this->getOpenidFromMp($code);
           }else{
               $openid= session($code);
           }
           session($code, $openid);// ######  2019.03.01  加  为解决code been used

      return $openid;
   }
}

The logic is to convert the obtained openid into code Save the session with the name; when requesting again, check whether the session with the name code in the request exists to prevent the code from being used twice.

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