WeChat public platform OAuth20 web page authorization php example

1. Configure the domain name of the authorization callback page, such as www.aaa.com

2. Simulate the third-party webpage of the official account, fn_system.php

Php code

3. if(emptyempty($_SESSION['user'])) {
5. header ("Location:http://www.aaa.com/uc/fn_wx_login.php"); [
6. 'user']);
}
7. ?>
8. 3. When accessing a third-party web page, if there is no session information in the session , then jump Go to the login page, fn_wx_login.phpPhp code

=

"Appid of official account in WeChat"
;
$url
2. =
'https://open.weixin.qq.com/connect/oauth2/authorize?appid='
3. .$appid. '&redirect_uri=http%3a%2f%2fwww.aaa.com%2fuc%2ffn_callback.php&resp/span>;
4. header("Location:".$url); ?>
5. On the user authorization page of WeChat, if the user selects "Agree Authorization", the code parameter will be attached when WeChat jumps back to the bounce address of the third-party web page.
5. 6. In the bounce URL of the third-party web page, first obtain the code from the request, and then exchange it for openid and access_token based on the code. Then you can call the relevant interface of WeChat based on openid and access_token to query user information. Php code
   3. $appid = "appid of the official account in WeChat";
   4. $secret = " The official account is in the WeChat app secret"; $get_token_url
   5. = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$appid.'&secret='.$secret
   6. . '&code='.$code.'&grant_type=authorization_code'; curl_init(); curl_setopt ($ch,CURLOPT_URL,$get_token_url); curl_setopt($ch,CURLOPT_HEADER,0); curl_setopt($ch
   7. , CURLOPT_RETURNTRANSFER, 1);
   8. curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
   9. $res = curl_exec($ch );
   10. curl_close( $ch); //Query user information based on openid and access_token
   11. $access_token
   12. = $json_obj['access_token'
   13. ]; $openid = $json_obj
   14. ['openid' ];
   15. $get_user_info_url = 'https://api.weixin.qq.com/sns/userinfo?access_token='.$access_token
   16. . ' &openid='
   17. .$openid.'&lang=zh_CN'
   18. ; $ch = curl_init ();
   19. curl_setopt( $ch,CURLOPT_URL,$get_user_info_url); curl_setopt($ch
   20. ,CURLOPT_HEADER,0); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1 ) ; curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10); $res = curl_exec($ch );
   21. curl_close($ch
   );
   23. // Parse json $res,true);
   24. $ _SESSION['user'] =
   25. $user_obj;
   print_r(
   26. $user_obj);
   27. ?> The above has introduced the WeChat public platform OAuth20 web page authorization PHP example, including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.