织梦dedecms子栏目怎么调用获得顶级栏目的ID号

{dede:type}[feild:topid/]{/dede:type}

$row = $dsql->GetOne(“Select id,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath
From `dede_arctype` where id=’$typeid’ “);

$row = $dsql->GetOne(“Select id,topid,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath
From `dede_arctype` where id=’$typeid’ “);

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