MrKen Fix Giúp :))

<?php
 
define('_IN_JOHNCMS', 1);
require('incfiles/core.php');
if (isset($_POST['msg'])) {
   $msg = isset($_POST['msg']) ? mb_substr(trim($_POST['msg']), 0, 5000) : '';
   $flood = functions::antiflood();
   if ($ban['1'] || $ban['13'])
       $error[] = $lng['access_forbidden'];
   if ($flood)
       $error = $lng['error_flood'] . ' ' . $flood . '&#160;' . $lng['seconds'];
   if (!$error) {
       $req = mysql_query("SELECT * FROM `guest` WHERE `user_id` = '$user_id' ORDER BY `time` DESC");
       $res = mysql_fetch_array($req);
       if ($res['text'] == $msg) {
           exit;
       }
   }
   if (!$error) {
       mysql_query("INSERT INTO `guest` SET
            `adm` = '$admset',
            `time` = '" . time() . "',
            `user_id` = '$user_id',
            `name` = '$from',
            `text` = '" . mysql_real_escape_string($msg) . "',
            `ip` = '" . core::$ip . "',
            `browser` = '" . mysql_real_escape_string($agn) . "'
       ");
       if ($user_id) {
          $postguest = $datauser['postguest'] + 1;
          mysql_query("UPDATE `users` SET `postguest` = '$postguest', `lastpost` = '" . time() . "' WHERE `id` = '$user_id'");
       }
   }
}
$total = mysql_result(mysql_query("SELECT COUNT(*) FROM `guest` WHERE `adm`='0'"), 0);
  if ($total) {
        $req = mysql_query("SELECT `guest`.*, `guest`.`id` AS `gid`, `users`.`lastdate`, `users`.`id`, `users`.`rights`, `users`.`name`
                    FROM `guest` LEFT JOIN `users` ON `guest`.`user_id` = `users`.`id`
                    WHERE `guest`.`adm`='0' ORDER BY `time` DESC LIMIT ".(!$is_mobile ? 5 : 5)."");
echo '<div class="forumtxt">';
        while ($gres = mysql_fetch_assoc($req)) {
        $post = $gres['text'];
        $post = functions::checkout($gres['text'], 1, 1);
        if ($set_user['smileys'])
          $post = functions::smileys($post, $gres['rights'] ? 1 : 0);
          $outputhtml .= (time() > $gres['lastdate'] + 300 ? ' <div class="list1"><img src="/images/OFF.gif" title="Ngoại Tuyến" /> ' : ' <div class="list1"><img src="/images/ON.gif" title="Trực Tuyến" /> ').'<a href="/users/profile.php?user='.$gres['id'].'"><b>'. htmlspecialchars($gres['name']).'</b></a>: '.$post.'<br /></div>';
          ++$i;
        }
      echo $outputhtml;
echo '</div>';
  }
?>

echo $var_dum($datauser);
echo $var_dum($set_user);

<?php
define('_IN_JOHNCMS', 1);
$rootpath = '';
require('incfiles/core.php');
if (isset($_POST['msg'])) {
   $msg = isset($_POST['msg']) ? mb_substr(trim($_POST['msg']), 0, 5000) : '';
   $flood = functions::antiflood();
   if ($ban['1'] || $ban['13'])
       $error[] = $lng['access_forbidden'];
   if ($flood)
       $error = $lng['error_flood'] . ' ' . $flood . '&#160;' . $lng['seconds'];
   if (!$error) {
       $req = mysql_query("SELECT * FROM `guest` WHERE `user_id` = '$user_id' ORDER BY `time` DESC");
       $res = mysql_fetch_array($req);
       if ($res['text'] == $msg) {
           exit;
       }
   }
   if (!$error) {
       mysql_query("INSERT INTO `guest` SET
            `adm` = '$admset',
            `time` = '" . time() . "',
            `user_id` = '$user_id',
            `name` = '$from',
            `text` = '" . mysql_real_escape_string($msg) . "',
            `ip` = '" . core::$ip . "',
            `browser` = '" . mysql_real_escape_string($agn) . "'
       ");
       if ($user_id) {
          $postguest = $datauser['postguest'] + 1;
          mysql_query("UPDATE `users` SET `postguest` = '$postguest', `lastpost` = '" . time() . "' WHERE `id` = '$user_id'");
       }
   }
}
$total = mysql_result(mysql_query("SELECT COUNT(*) FROM `guest` WHERE `adm`='0'"), 0);
  if ($total) {
        $req = mysql_query("SELECT `guest`.*, `guest`.`id` AS `gid`, `users`.`lastdate`, `users`.`id`, `users`.`rights`, `users`.`name`
                    FROM `guest` LEFT JOIN `users` ON `guest`.`user_id` = `users`.`id`
                    WHERE `guest`.`adm`='0' ORDER BY `time` DESC LIMIT ".(!$is_mobile ? 6 : 6).""); 
echo '<div class="forumtxt">';
        while ($gres = mysql_fetch_assoc($req)) {
        $post = $gres['text'];
        $post = functions::checkout($gres['text'], 1, 1);
        if ($set_user['smileys'])
          $post = functions::smileys($post, $gres['rights'] ? 1 : 0);
          $outputhtml .= (time() > $gres['lastdate'] + 600 ? ' <div class="list1"><img src="/images/offline.png" /> ' : ' <div class="list1"><img src="/images/online.png" /> ').'<a href="/users/'.$gres['name'].'_'.$gres['id'].'.html"><b>'. nick($gres['id']).'</b></a>: '.$post.'<br /></div>';
          ++$i;
        }
      echo $outputhtml;
echo '</div>';
  }
?>