php获取真实IP

51漂泊

1. function GetIP(){
   
2. if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
   
3. $ip = getenv("HTTP_CLIENT_IP");
   
4. else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
   
5. $ip = getenv("HTTP_X_FORWARDED_FOR");
   
6. else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
   
7. $ip = getenv("REMOTE_ADDR");
   
8. else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
   
9. $ip = $_SERVER['REMOTE_ADDR'];
   
10. else
    
11. $ip = "unknown";
    
12. return($ip);
    
13. }
    
14. echo GetIP();

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