专题列表怎么限制调用10条内容？大佬们帮看看，谢谢

{loop $special_content $val}

{php $tablename = get_model($val['modelid']);}

{php $db = D($tablename);}

{php $res = $db->where(array('id'=>$val['aid']))->find();}

<div class="special_list">

<a href="{$res[url]}">

<p class="title">{$res[title]}</p>

<p>更新时间：{date('Y-m-d', $res['updatetime'])}</p>

</a>

</div>

{/loop}