用PHP写一个微信登录，并获取这个登录用户的手机号的案例

<?php
// 获取微信登录凭证code
$code = $_GET['code'];

// 发起请求获取access_token和openid
$appid = 'your_appid';
$secret = 'your_secret';
$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appid&secret=$secret&code=$code&grant_type=authorization_code";
$response = file_get_contents($url);
$result = json_decode($response, true);

// 获取到access_token和openid后，再发起请求获取用户手机号
$access_token = $result['access_token'];
$openid = $result['openid'];
$url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid";
$response = file_get_contents($url);
$userInfo = json_decode($response, true);

// 输出用户手机号
$phoneNumber = $userInfo['phonenumber'];
echo "用户手机号: $phoneNumber";
?>