织梦channelartlist判断是否有下级栏目输出不同的html代码

function display_ul($i,$var='0'){
    global $dsql;
    $row = $dsql->GetOne("SELECT COUNT(id) as num FROM dede_arctype  WHERE reid = $i)");
    if($row['num']>0 ){
        if($var=='0'){
           return "<ul>"; 
        }else{
           return "</ul>";  
        }
    }
}

{dede:channelartlist row=7 typeid=top currentstyle=current}
<li>
    <a href="{dede:field.typeurl/}">{dede:field.typename/}</a>
    {dede:field.id function='display_ul(@me)'/}
        <!-- 二级栏目 -->
        {dede:channel type=son noself=yes}
        <li>
            <a href="[field:typelink/]">[field:typename/]</a>
        </li>
        {/dede:channel}
    {dede:field.id function='display_ul(@me,1)'/}
</li>
{/dede:channelartlist}