phpcms v9 多级下拉菜单的子栏目调取方法
phpcms v9 多级下拉菜单的子栏目调取方法，复制以下代码即可实现：
<ul>
{pc:content action="category" catid="0" num="12" siteid="$siteid" order="listorder ASC"}
{loop $data $c}
<li><a href="{$c['url']}">{$c['catname']}</a>
<ul>
{loop subcat($c['catid']) $c2}
<li><a href="{$c2['url']}">{$c2['catname']}</a>
<ul>
{loop subcat($c2['catid']) $c3}
<li><a href="{$c2['url']}">{$c3['catname']}</a></li>
{/loop}
</ul>
</li>
{/loop}
</ul>
</li>
{/loop}
{/pc}
</ul>
