如题一样，比如最新
主题之类的，都可以，但是最新回复不可以，我随便回复了一个帖子，可是在最新回复里面没有反映，，怎么回复，都不会显示最新回复的帖子！求救一下
以下是我的
代码，，高手帮忙看看那里的问题！
//最新回复主题开始
$query = $db->query("SELECT pt.tid,pt.author,pt.subject,pt.postdate,pt.lastpost,pt.lastposter,pt.hits,pt.replies,pf.name,pf.fid FROM pw_threads pt LEFT JOIN pw_forums pf USING(fid) where pt.ifcheck = '1' and pt.replies > 0 and ".$showforum." and pf.password = '' order by lastpost desc limit 0,$listnum");
$c_i=1;//初始化图片序号
while($threads=$db->fetch_array($query)){
$threads[postdate]=get_date($threads[postdate]);
$threads[lastpost]=get_date($threads[lastpost]);
$subject=substrs($threads[subject],$listlength);
$replythreads.="<img src='$imgpath/top/c_".$c_i.".gif' align='absmiddle' width='11' height='11'> <a href='thread.php?fid=$threads[fid]'>[$threads[name]]</a> <a href='read.php?tid=$threads[tid]' title='主题
标题:$threads[subject]\n主题作者:$threads[author]\n发表时间:$threads[postdate]\n浏览次数:$threads[hits] 次\n最新回复:$threads[lastposter]\n回复时间:$threads[lastpost]\n回复次数:$threads[replies] 次'>$subject</a><br />";
$c_i++;
}
unset($threads);
unset($c_i);
//最新回复主题结束
