function GetIP(){  
    if (!empty($_SERVER['HTTP_CLIENT_IP'])){  
        $ip=$_SERVER['HTTP_CLIENT_IP'];  
    }elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){  
        $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];  
    }else{  
        $ip=$_SERVER['REMOTE_ADDR'];  
    }

    return $ip;  
}