〔提交〕调用指定论坛的贴子怎么实现？

<?php
include_once 'bmtxt.php';
include_once 'db/db.php';
include_once 'db/u2gb.php';
$db=new dbclass('db/bbs.db3');
?>
<?php
$tz=$db->select('tz','where bkid=要调用的板块id','order by fttime desc','15','bkid,id,title');
foreach($tz as $i=>$tzi)
{echo $i,'. <a href="read.php?id=bbs_tz&tzid=',$tzi['id'],'&bkid=',$tzi['bkid'],'">',bmtxt(mb_substr($tzi['title'],0,20,'utf-8')),'</a>
';}
?>