function getClientIP() {
     if (isset($_SERVER['HTTP_CLIENT_IP'])){
         $ipaddress = $_SERVER['HTTP_CLIENT_IP'];
     }else if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])){
         $ipaddress = $_SERVER['HTTP_X_FORWARDED_FOR'];
     }else if(isset($_SERVER['HTTP_X_FORWARDED'])){
         $ipaddress = $_SERVER['HTTP_X_FORWARDED'];
     }else if(isset($_SERVER['HTTP_FORWARDED_FOR'])){
         $ipaddress = $_SERVER['HTTP_FORWARDED_FOR'];
     }else if(isset($_SERVER['HTTP_FORWARDED'])){
         $ipaddress = $_SERVER['HTTP_FORWARDED'];
     }else if(isset($_SERVER['REMOTE_ADDR'])){
         $ipaddress = $_SERVER['REMOTE_ADDR'];
     }else{
         $ipaddress = 'UNKNOWN';
    }

    return $ipaddress; 
}