How to implement WeChat code scanning login in PHP

php method to implement WeChat code scanning login: 1. Build a link for scanning code login and redirect the user to the link; 2. Guide the user to scan the QR code; 3. Receive the callback and Extract the access token and openid from it; 4. Use the access token and openid to obtain user information, and store it in a variable for later use to achieve WeChat scan code login.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

php method to implement WeChat scan code login:

1. Build a link for scan code login and redirect the user to the link;

// 第一步：构建请求网址
$redirect_uri = urlencode('https://yourwebsite.com/wechat_callback.php');
$scope = 'snsapi_login';
$appid = 'YOUR_APPID';
$url = "https://open.weixin.qq.com/connect/qrconnectappid=$appid&redirect_uri=$redirect_uri&response_type=code&scope=$scope&state=STATE#wechat_redirect";

2. Guide the user to scan the QR code;

// 第二步：引导用户扫描二维码
header("Location: $url");

3. Receive the callback and extract the access token and openid;

// 第三步：接受回调，获取access_token和openid
$code = $_GET['code'];
$app_secret = 'YOUR_APP_SECRET';
$url = "https://api.weixin.qq.com/sns/oauth2/access_tokenappid=$appid&secret=$app_secret&code=$code&grant_type=authorization_code";
$response = file_get_contents($url);
$params = json_decode($response);
$access_token = $params->access_token;
$openid = $params->openid;

4. Use the access token and openid to obtain the user information and store it in a variable for later use.

// 第四步：使用access_token和openid获取用户信息 
$url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN"; 
$response = file_get_contents($url); 
$userinfo = json_decode($response); 
// 获取用户信息 
$username = $userinfo->nickname; 
$avatar = $userinfo->headimgurl;

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