网页授权php

<?php
// 1. 引导用户到授权服务器获取授权码
$redirect_uri = 'https://yourdomain.com/callback.php';
$scope = 'snsapi_userinfo';
$state = 'STATE';

$auth_url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=YOUR_APP_ID&redirect_uri=$redirect_uri&response_type=code&scope=$scope&state=$state#wechat_redirect";
header("Location: $auth_url");

// 2. 回调处理，获取授权码并交换访问令牌
if (isset($_GET['code'])) {
    $code = $_GET['code'];
    $token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=YOUR_APP_ID&secret=YOUR_APP_SECRET&code=$code&grant_type=authorization_code";

    $response = file_get_contents($token_url);
    $token_data = json_decode($response, true);

    if (isset($token_data['access_token'])) {
        $access_token = $token_data['access_token'];
        $openid = $token_data['openid'];

        // 使用access_token和openid获取用户信息
        $user_info_url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN";
        $user_info_response = file_get_contents($user_info_url);
        $user_info = json_decode($user_info_response, true);

        // 处理用户信息
        print_r($user_info);
    } else {
        echo "获取访问令牌失败";
    }
}
?>