dede怎样调用单个图集包含多少张图片的张数

{dede:listpagesize='12'}   
        <SPANclass=SXC>
<a href=[field:arcurl/]target=_blank><imgsrc=[field:litpic/] alt="[field:title/]" width=40 height=40border=0></a><br>
<a href=[field:arcurl/]target=_blank>[field:title/]</a>
<br>共[field:id  function="Getimgnum(@me)"/]张
</SPAN>            
 {/dede:list}  
下面实现修改:
在 include/common.func.php增加一函数

functionGetimgnum($aid)   
{   
    global$dsql;   
    $imgurls= '';   
    $row=$dsql->getone( "Select imgurls From`dede_addonimages` where aid='$aid'");   
       
        $imgurls=$row['imgurls'];   
  
preg_match_all("/{dede:img(.*){\/dede:img/isU",$imgurls,$wordcount);    
  
$count=count($wordcount[1]);   
    return$count;   
  
}  {dede:listpagesize='12'}   
        <SPANclass=