PHP Simple port scanner

<?php
error_reporting(0);
/* 
Range : 1-1000
you can control it from this line


for($i=[1];$i<=[1000];$i++) {


How script worked ?
upload it to somewhere and type on URL bar this
http://site.com/portscanner.php?ip= [Someone's ip] 
then click enter and you must wait to scann
then script show you whos port is opened.
*/
$ip = $_GET['ip'];
if(isset($ip)) {
for($i=1;$i<=1000;$i++) {
    $conn = @fsockopen($ip, $i);
    if ($conn) {
        echo "Port $i is open on $ip. <br />";
    fclose($conn);
    }
}
}
?>