如何用PHP语法写一个微信登录功能，并获取这个登录用户的手机号？

<?php
// 这里是您的微信登录功能的代码

// 获取用户授权后的 access_token
$code = $_GET['code'];
$appId = 'YOUR_APP_ID';
$appSecret = 'YOUR_APP_SECRET';

$url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appId."&secret=".$appSecret."&code=".$code."&grant_type=authorization_code";
$response = file_get_contents($url);
$data = json_decode($response, true);
$accessToken = $data['access_token'];

// 获取用户信息
$openid = $data['openid'];
$url = "https://api.weixin.qq.com/sns/userinfo?access_token=".$accessToken."&openid=".$openid;
$response = file_get_contents($url);
$userData = json_decode($response, true);
$phoneNumber = $userData['phone_number'];

echo "用户手机号：" . $phoneNumber;
?>