PHPcms怎么调用二级栏目

{pc:content action="category" catid="0" num="25" siteid="$siteid" order="listorder ASC"}
    <a href="{siteurl($siteid)}" title="首页">首 页</a>
    {loop $data $k $r}
        <a href="{$r[url]}" title="{$r[catname]}" class="">{$r[catname]}</a>
        {pc:content action="category" catid="$k" num="25" siteid="$siteid" order="listorder ASC"}
            {loop $data  $v}
                <a href="{$v[url]}" title="{$r[catname]}">{$v[catname]}</a>
            {/loop}
        {/pc}
    {/loop}
{/pc}