F*U*R*B*Y* commented on a Page, PHP Port Checker - Dec 05, 2008

  else if ($_GET["port"] && $_GET["port2"]) {
    $p1 = $_GET["port"];
    $p2 = $_GET["port2"];
    if ($p1 == $p2) {
      $fp = @fsockopen($addr, $port, $errno, $errstr, 2);

sorry, but where is $port set?
should check to see if $_GET['port'] and $_GET['port2'] is numeric

if (is_numeric($_GET['port']) && is_numeric($_GET['port2'])) {

besides that, not bad....

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