$row['highlight'] = 0;

$count = $dsql->GetOne("SELECT COUNT(tid) FROM `dede_taglist` WHERE tag = '".$row['tag']."'");
$row['count'] = $count['count(tid)'];

{dede:tag row='500' sort='new' getall='0'}
<li><a href="[field:lk/]" title="[field:tag /]">[field:tag /]</a><span>([field:total /])</span></li>
{/dede:tag}