我为每个系统获得相同的IP - 如何通过PHP编码获取IP地址

Question

Hello i am using this function to get IP Address of different systems..but everytime it returns the same value: 117.239.82.182

function getRealIpAddr()
{
   if (!empty($_SERVER['HTTP_CLIENT_IP']))   //check ip from share internet
   {
     $ip=$_SERVER['HTTP_CLIENT_IP'];
   }
   elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))   //to check ip is pass from proxy
   {
     $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
   }
   else
   {
      $ip=$_SERVER['REMOTE_ADDR'];
   }
   return $ip;
}

Answer 1

117.239.82.182 is an external IP address. If all the systems that connect to the PHP server are behind the same external IP address, all of them will be notet as the same IP address.

Your script doesn't take the local IP. Don't think it's even possible. The IP you are seeing, is the IP of the firewall of your company.

Answer 2

EDIT: (The answer changed radically after some clarifications in the comments)

You could edit the User-Agent setting of the user's browsers. To see how to change the setting in various browsers follow this link . Then you should modify your PHP script to read User-Agent of the browser. In PHP, $_SERVER['HTTP_USER_AGENT'] returns the browser's User-Agent setting. Eg. you can define as User-Agent something like Company/System/1.02 Bla bla bla . Then when you receive that same string you can assume it is coming from a known host.

Attention that the User-Agent can be easily spoofed. So this method is not secure. The secure solution would be to implement a VPN solution.