StimuL
$query = mysql_query("SELECT `id`,`name` FROM `users` ORDER BY `time` DESC LIMIT '1'");
$userdata = mysql_fetch_assoc($query);
echo '<a href="' . core::$system_set['homeurl'] . '/users/profile/?user=' . $userdata['id'] . '">' . htmlentities($userdata['name'], ENT_QUOTES, 'UTF-8') . '</a>';