$str = $_SERVER['HTTP_REFERER']; // http://www.google.com/search?q=kata+kunci&ie=utf-8&oe=utf-8&aq=t
$str = parse_url($str, PHP_URL_QUERY); // q=kata+kunci&ie=utf-8&oe=utf-8&aq=t
parse_str($str);
echo htmlspecialchars($q); // kata kunci
echo htmlspecialchars($ie); // utf-8