Minecraft login

$user = $_POST['user'];
$pass = $_POST['pass'];
$response = file_get_contents('http://login.minecraft.net/?user='.$user.'&password='.$pass.'&version=12');
$values = explode(':', $response);
if(count($values) > 1)
{
    $user = $values[2];
    $sessionId = $values[3];
    $response = file_get_contents('http://session.minecraft.net/game/joinserver.jsp?user='.$user.'&sessionId='.$sessionId.'&serverId=1');
    if($response == 'OK')
    {
    $_SESSION['valid'] = 1;
    $_SESSION['redir'] = 'http://snuletek.org/site/mc/mcArch.php';
    echo('
        <script>
            document.location = "http://snuletek.org/site/mc/mcArch.php";
        </script>
    ');
    }
}
else
{
    variableEcho(0, $user, 'Username or password incorrect, or you don\'t own minecraft'); //My function to echo the html form with previously entered values preserved, and in this case, an error message.
}