bug about nonecms HOT 3 OPEN

            /*存在子类，则获取子类下的文章*/
            if($cid){
                $condition['cid'] = $cid;
                $children_ids = think\Db::name('category')->field('id')->where('pid',$condition['cid'])->select();
                $children_ids = array_column($children_ids,'id');   /***## 出错在这一行***/
            }
            $list = think\Db::name('article')->where($condition);
            if(isset($children_ids) && $children_ids){
                 $list = $list->whereor('cid','in',$children_ids);
             }

            if("" != ''){
                $list=$list->field("");
            }