How To Track the Real IP Address Behind the Proxy

IP Address: It is unique address of the client machine by which we track the user detail requesting for some request.

Get the Unique IP Address of client machine

function get_ip_address(){
 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;
}

echo get_ip_address();