织梦DedeCMS搜索指定多个栏目文档的办法

<form name="search" action="/plus/search.php"> 
<input type="hidden" name="typeid" value="1,2,3">
</form>

$typeid = (isset($typeid) && is_numeric($typeid)) ? $typeid : 0;

$typeid = intval($typeid);

$ksqls[] = " arc.typeid IN (".GetSonIds($this->TypeID).") ";

//指定了多个栏目时
            if( preg_match('#,#', $this->TypeID) )
            {
                $typeids = explode(',', $this->TypeID);
                foreach($typeids as $ttid) {
                    $typeidss[] = GetSonIds($ttid);
                }
                $typeidStr = join(',', $typeidss);
                $typeidss = explode(',', $typeidStr);
                $typeidssok = array_unique($typeidss);
                $typeid = join(',', $typeidssok);
                $ksqls[] = " arc.typeid IN ($typeid) ";
            }
            else
            {
                $ksqls[] = " arc.typeid IN (".GetSonIds($this->TypeID).") ";
            }