实现代码如下：

{loop subcat($catid) $c}    {if $c['child']}    {php $child = subcat($c['catid']);}      
     
              
      
               	
       
                    
       
        {php echo $c['catname'];}+            
        
                     	
         {php echo "
          
           ".$c['catname']."";}
                          
         
                          	{loop $child $catc}                		{php $subcatid[] = $catc['catid'];}                    	{php echo "
          
           ".$catc['catname']."";}                    {/loop}                                            
           
                 {php $subcatid  = implode(',', $subcatid);}{php $arr=explode(',',$subcatid);}{pc:get sql="SELECT * from v9_news where status=99 and catid in ($subcatid) order by id DESC LIMIT 0,4--" num="6" return="data"} {loop $data $r}             
            
 
             
              ● [{$CATEGORYS[$r[catid]][catname]}] {str_cut($r['title'],40)}
             
   {/loop}{/pc}        
           
        
           
                    {php echo "
            
             我想了解更多".$c['catname']."知识";}                     {php $subcatid = null;}  {/if}{/loop}