phpcms 联动菜单无限级GET标签调用代码

{pc:get sql="SELECT * FROM  `v9_linkage` WHERE parentid=0 AND keyid=1 ORDER BY listorder ASC" num="100" return="data" }<!--调用条件说明：parentid=0，父级ID(默认联动菜单“中国”)；keyid=1，菜单ID，添加字段时使用那个的ID-->
 {loop $data $n $v}
    <li>
            <h2><a href="{$v['linkageid']}" title="{$v['name']}" target="_blank">{$v['name']}</a></h2>
        <ul> 
        <!--二级调用-->
        {pc:get sql="SELECT * FROM  `v9_linkage` WHERE parentid=$v[linkageid]  ORDER BY listorder ASC" num="100" return="smenu" }
            {loop $smenu $n $m}
            <li>
                <h3><a href="{$m['linkageid']}" title="{$m['name']}" target="_blank">{$m['name']}</a></h3>
                <!--三级调用  如此循环可以调用4级、5级.....无限级分类-->
                {pc:get sql="SELECT * FROM  `v9_linkage` WHERE parentid=$m[linkageid]  ORDER BY listorder ASC" num="100" return="tmenu" }
                <h4>
                    {loop $tmenu $n $r}
                        <a href="{$r['linkageid']}" title="{$r['name']}" target="_blank">{$r['name']}</a>
                    {/loop}
                </h4> 
                {/pc}
            </li>
            {/loop}
        {/pc}
         </ul>
     </li>
{/loop}
{/pc}