Get IP address (even when connecting via a proxy)

Returns the real IP address of a visitor, even when connecting via a proxy.

Source : http://roshanbh.com.np/2007/12/getting-real-ip-address-in-php.html 

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;
}