PHP Website Open Port Check

<?
$domain = "sz.ma.cx";

set_time_limit("0");

echo "http://$domain<BR><BR>";

function online($what,$link,$port) {
  echo "<TABLE cellSpacing=0 cellPadding=1 width=50%><TR>";
  echo "<TD width=50>$what";
  $churl = @fsockopen($link, $port, $errno, $errstr, 20);

  echo "<TD align=left><TABLE bgcolor=silver cellSpacing=1 cellPadding=1><TR>";
  if (!$churl) { echo "<TD align=center bgcolor=red width=80>OFFLINE"; }
  else { echo "<TD align=center bgcolor=#00FF00 width=80>ONLINE"; }
  echo "</TABLE></TABLE>";
}

online("HTTP","google.com","80");
online("FTP","google.com","21");
online("SSH","google.com","22");
online("DNS","google.com","53");
online("mySQL","google.com","3306");
online("POP3","google.com","110");
online("SMTP","google.com","25");
?>