dedecms怎么在列表页调用或实现显示图片集的张数

function Getimgnum($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;      
}