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}