php hacking nut.. Anybody?

Have a little nut for you, what can be gotten out of this:

................................................

<?PHP

$z = $_POST['pw'];
$x = str_rot13($_POST['pw']);
$y = preg_split("//", $x, -1, PREG_SPLIT_NO_EMPTY);
$y = implode(".", $y);
$a = explode(".", $y);
$a = array_reverse($a);
$a = implode("", $a);


if(isset($_POST['submit']) && $a == "iamahacker")
{
header("location: ?page=level23&pw=$z");
}

?>

Thanks,
Gnome

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