포트체크 방법

<? 
$action    = $_POST["action"]; 
$portaddres = $_POST["portaddres"]; 
$ipaddres  = $_POST["ipaddres"]; 


if($action == 'y'){ 
        $port_array = explode(",",$portaddres); 
echo "IP :".$ipaddres.'<br>'; 
        for($i=0;$i<count($port_array); $i++){ 
ob_implicit_flush(true); 
$fp = @fsockopen($ipaddres, $port_array[$i], $errno, $errstr, 2); 
            echo $port_array[$i]; 
ob_end_flush(); 
if($fp){ echo " <font color=#0000FF>Open</font><br>"; 
} else { echo " <font color=#FF0000>Close</font><br>";} 
} 

} 

?>