DEDECMS给list标签加上多字段排序功能

dedecms的list标签orderby属性只支持按一个字段排序，假如想多个字段排序的话，就需要对PHP举办修改，使其可以支持多字段排序，修改如下：

打开include/arc.listview.class.php，找到：
 

替换为：

if($orderby=="default") { $t1 = ExecTime(); $ids = array(); $query = "SELECT id FROM `js_arctiny` arc WHERE {$this->addSql} $ordersql LIMIT $limitstart,$row "; $this->dsql->SetQuery($query); $this->dsql->Execute(); while($arr=$this->dsql->GetArray()) { $ids[] = $arr['id']; } $idstr = join(',',$ids); if($idstr=='') { return ''; } else { $query = "SELECT arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname, tp.namerule,tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath $addField FROM `js_archives` arc LEFT JOIN `js_arctype` tp ON arc.typeid=tp.id $addJoin WHERE arc.id in($idstr) $ordersql "; } $t2 = ExecTime(); //echo $t2-$t1; } else { $query = "SELECT arc.*,tp.typedir,tp.typename,tp.isdefault,tp.defaultname, tp.namerule,tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath $addField FROM `js_archives` arc LEFT JOIN `js_arctype` tp ON arc.typeid=tp.id $addJoin WHERE {$this->addSql} $ordersql LIMIT $limitstart,$row"; }  

找到：

else { $ordersql=" ORDER BY arc.sortrank $orderWay"; }  

替换为:
 

此刻在模板中就可以应用了多字段排序了，模板应用如下：

{dede:list pagesize='17' orderby='arc.title desc,arc.id'}