tp框架union的闭包写法记录

$get_act = Db::field($field)
            ->table('yook_activity')
            ->where($wheresss)
            ->where('act_sign_end_time','gt',time())
            ->order("toptime desc")
            ->page($page, $limit)
            ->union(function ($query) use($wheresss, $field){
//                d($wheresss);
                $wheresss['act_sign_end_time'] = ['lt',time()];
                $wheresss['act_start_time'] = ['gt',time()];
                $wheresss['act_end_time'] = ['gt',time()];
                $query->field($field)
                    ->table('yook_activity')
                    ->where($wheresss)
                    ->order("toptime desc");
            })
            ->union(function ($query) use ($wheresss, $field) {
                $wheresss['act_end_time'] = ['lt',time()];
                $query->field($field)
                    ->table('yook_activity')
                    ->where($wheresss)
                    ->order("toptime desc");
            })
            ->select();