{php $where="`catid` != $catid"}

{pc:content action="category" catid="0" where="$where" num="6" siteid="$siteid" order="listorder asc"}

但我测试没管用，我一般用get标签

        {pc:get sql="select * from `en_category` where `catid` != $catid and parentid=0 order by listorder asc" return="data"}