Comment implémenter la connexion par analyse de code WeChat en PHP

// 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";

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

// 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;

// 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;