DedeCMS获取栏目图片如果没有栏目图片调用顶级图片

/*

  * 获取本栏目图片,只有找不到时候才返回顶级图片

  * $typeid 栏目id

  * $default_pic 找不到时候默认图片

  * [field:id function='get_channel_pic(@me)'/]

  * */

function get_channel_pic($typeid,$default_pic="/images/defaultpic.gif")

{

        global $dsql;

        $row = $dsql->GetOne("SELECT typepic,topid FROM dede_arctype WHERE id= $typeid");

if(empty($row['typepic'])){

        if(0 == $row['topid']){

                return $default_pic;

        }else{

                $row1 = $dsql->GetOne("SELECT typepic FROM dede_arctype WHERE id= $row[topid]");

                return (empty($row1['typepic']))?$default_pic:$row1['typepic'];

        }

}else{

        return $row['typepic'];

}

}