由于微信网页开发，需要获取用户信息，所以就需要网页授权，但是在微信公众平台公众号只能设置一个回调域名，现在
只有一个公众号，但是我多个业务不同的域名，并都需要拿到用户信息，这时一个回调域名肯定是不能解决问题的，因为公众号设置的回调域名必须要与项目域名一致，不然就会报redirect_uri域名错误。
实现思路：
中转域名地址（http://www.zhongzhuan.com），其他要授权的域名先去请求中转地址，并会把获取的code,state原封不动的返回到原来的地址,这样就可以用返回的code去获取access_token,从而通过access_token获取用户信息
1、我们把微信授权的回调域名设置成中转域名地址（http://www.zhongzhuan.com）
2、把调起微信授权代码放到（http://www.zhongzhuan.com/index.php）
<?php
const APPID="";
class Wx_auth{
//准备scope为snsapi_userInfo网页授权页面，获取code
public static function authorize($params){
$responseType=$params['response_type'];//返回类型，请填写code
$scope=$params['scope'];//应用授权作用域
$state=$params['state'];//重定向后会带上state参数 自定义
$redirect_url='http://www.zhongzhuan.com/index.php';//这里的域名就是公众号设置的域名
$redirect_url = urlencode($redirect_url);
$get_userInfo_url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid='.APPID.'&redirect_uri='.$redirect_url .'&response_type='.$responseType.'&scope='.$scope.'&state='.$state.'#wechat_redirect';
header('Location:'.$get_userInfo_url);die;
}
//把回调结果返回最开始的授权业务
public static function redirect($code,$state){
$redirect_uri=$_COOKIE['redirect_uri'];
header('Location:'.$redirect_uri.'?code='.$code."&state=".$state);die;
}
}
if(!isset($_GET['code'])){
//最开始授权回调地址
if(isset($params['redirect_uri'])){
setcookie('redirect_uri',urldecode($params['redirect_uri']));
}
Wx_auth::authorize($_GET);
}else{
Wx_auth::redirect($_GET['code'],$_GET['state']);
}
3、另外要授权的域名项目（http://www.a.com）,这是我们先去跳转到中转地址，由中转地址调起授权页面，用户点击授权登录，获取code，state原封不动的返回到（http://www.a.com/index.php）,然后拿到code去获取用户信息
$appid='';
$appsecret='';
//1.准备scope为snsapi_userInfo网页授权页面
$redirect_url='http://www.a.com/index.php';
$redirecturl = urlencode($redirect_url);
//参数
$params=[
'redirect_uri'=>$redirecturl,
'response_type'=>'code',
'scope'=>"snsapi_userinfo",
'state'=>"fff"
];
$param_str=urldecode(http_build_query($params));;
//中转地址,获取code
$get_code_url = 'http://www.zhongzhuan.com?'.$param_str.'#wechat_redirect';
//2.用户手动同意授权,同意之后,获取code
$code = $_GET['code'];
if( !isset($code) ){
header('Location:'.$get_code_url);die;
}
//3.通过code换取网页授权access_token
$get_access_token_url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$appsecret.'&code='.$code.'&grant_type=authorization_code';
$result = json_decode(file_get_contents($get_access_token_url));
//4.通过access_token和openid拉取用户信息
$get_user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$result->access_token.'&openid='.$result->openid.'&lang=zh_CN ';
$userInfo = file_get_contents($get_user_info_url);
$userInfo = json_decode($userInfo ,true);
print_r($userInfo);
亲测有效！真正的解决了授权域名回调只能填写一个的问题！
实现思路来源：https://www.cnblogs.com/lyzg/p/6159617.html
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版权声明：本文为CSDN博主「cywanp」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_38149009/article/details/80703639
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