function get_client_ip(){        $headers = array('HTTP_X_REAL_FORWARDED_FOR', 'HTTP_X_FORWARDED_FOR', 'HTTP_CLIENT_IP', 'REMOTE_ADDR');        foreach ($headers as $h){            $ip = $_SERVER[$h];            // unknown            if ( isset($ip) && strcasecmp($ip, 'unknown') ){                break;            }        }        if( $ip ){            list($ip) = explode(', ', $ip, 2);        }        return $ip;    }