static function online(){
$users = mysql_result(mysql_query("SELECT COUNT(*) FROM `users` WHERE `lastdate` > '" . (time() - 300) . "'"), 0);
$guests = mysql_result(mysql_query("SELECT COUNT(*) FROM `cms_sessions` WHERE `lastdate` > '" . (time() - 300) . "'"), 0);
//bo dem ngay va thang
$total = mysql_fetch_assoc(mysql_query("SELECT * FROM `counters`"));
if ($total['month'] == date(n)) {
if ($total['day'] == date(z)) { $count = $total['count'] + 1; }
   else { $count = 1; mysql_query("UPDATE `counters` SET `day` = '" . date(z) . "'"); }
$count_m = $total['count_m'] + 1;
mysql_query("UPDATE `counters` SET `count` = '$count',`count_m` = '$count_m'"); 
}else{
$count = $count_m = 1;
mysql_query("UPDATE `counters` SET `count` = '1', `count_m` = '1', `day` = '" . date(z) . "', `month` = '" . date(n) . "'"); 
}
//Xu ly gia tri
if ($count_m > 1000) {
$k = round($count_m/1000, 1);
$count_m = $k . 'k';
}
if ($count > 1000) {
$k = round($count/1000, 1);
$count = $k . 'k';
}
return (core::$user_id || core::$system_set['active'] ? '<a href="' . core::$system_set['homeurl'] . '/users/index.php?act=online" rel="nofollow" ><b>Online:</b> ' . $users . ' / ' . $guests . ' | <b>Total:</b> ' . $count . ' / ' . $count_m . '</a>' : '<b>Online:</b> ' . $users . ' / ' . $guests . ' | <b>Total</b>: ' . $count . ' / ' . $count_m);
}

DROP TABLE IF EXISTS `counters`;
CREATE TABLE `counters` (
  `count` int(10) unsigned NOT NULL DEFAULT '0',
  `day` int(10) unsigned NOT NULL DEFAULT '0',
  `month` int(10) unsigned NOT NULL DEFAULT '0',
  `count_m` int(10) unsigned NOT NULL DEFAULT '0'
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;