判断用户是否使用代理的PHP代码

1. /*****************************************************
2. *
3. * isProxy
4. * check whether client is under Proxy or not
5. * $_SERVER['HTTP_X_FORWARDED_FOR'] is pivotal here
6. * if client is under Proxy, returns true
7. * if client is not under Proxy, returns false
8. *
9. *****************************************************/
11. function isProxy(){
12. return (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) ? true : false;
13. }
14. ?>

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PHP