PHP implements WeChat public account login jump

In today's Internet era, WeChat public accounts are becoming more and more popular, and many companies or individuals operate their businesses on the WeChat platform. In order to facilitate user login, many websites provide the WeChat login function, but implementing the WeChat login function is not a simple matter. In this article, we will introduce how to use PHP to implement the WeChat official account login jump function.

1. First, create a WeChat public account

Create a public account on the WeChat public platform and obtain the AppID and AppSecret. AppID is used to identify the official account, and AppSecret is used to protect the security of the official account.

2. Add the WeChat login function to the website

In order to add the WeChat login function to the website, we need to add a button to the website for users to click and jump to the WeChat login interface.

The following is a simple HTML code example that will create a button and redirect the user to WeChat's authorization page. In the example, we have used the variables "$AppID" and "$redirect_uri", which need to be defined in the PHP script.

<a href="https://open.weixin.qq.com/connect/oauth2/authorize?appid=<?php echo $AppID;?>&redirect_uri=<?php echo urlencode($redirect_uri);?>&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect">
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</a>

In the above code, "$AppID" is the AppID you obtained on the WeChat public platform, and "$redirect_uri" is the URL address you want to redirect to. You need to replace these variables with your own AppID and URL address.

3. Process the code returned by the WeChat server

After the user clicks the WeChat login button, the server will return a code value. We need to submit this code value and AppSecret to the WeChat server and obtain the user's access token.

The following is a PHP code example that will process the code value returned by the WeChat server and submit a request to the WeChat server to obtain an access token.

$code = isset($_GET['code']) ? $_GET['code'] : '';
$appid = '你的AppID';
$secret = '你的AppSecret';
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
$result = https_request($url);
$jsoninfo = json_decode($result, true);
$access_token = $jsoninfo['access_token'];
$openid = $jsoninfo['openid'];

In the above code, "$code" is the code value returned by the WeChat server, "$appid" is the AppID you obtained on the WeChat public platform, and "$secret" is the code value you obtained on the WeChat public platform. AppSecret obtained on the platform. We submit these values ​​to the URL and use the https_request function to send a request to the WeChat server and finally obtain the access token.

4. Use the access token to obtain user information

After obtaining the access token and user ID, we can use the access token to obtain user information.

The following is a PHP code example that will get user information using the access token and user ID.

$url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
$result = https_request($url);
$jsoninfo = json_decode($result, true);
$nickname = $jsoninfo['nickname'];
$sex = $jsoninfo['sex'];
$province = $jsoninfo['province'];
$city = $jsoninfo['city'];
$country = $jsoninfo['country'];
$headimgurl = $jsoninfo['headimgurl'];

In the above code, "$url" is the request URL address, "$access_token" is the access token we obtained in the previous step, and "$openid" is the user's unique identifier. We submit these values ​​​​to the WeChat server and use the https_request function to send a request to the server, and finally obtain the user's detailed information.

Summary:

This article introduces how to use PHP to implement the WeChat official account login jump function. We added a WeChat login button to the website, and used PHP code to process the code value returned by the server, and finally obtained the user's detailed information. Hope this article is helpful to you.

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