laravel实现按月或天或小时统计mysql数据的方法

  /
    [getsellerdata 获取某时间段内商户结算查询数据]
    @param Request $request [description] start:起始时间 end:结束时间 
    @return [type]      [description]
   /
  public function getsellerqudata(Request $request){
    $data = $this->dataanalysis->getSellerQuData($request->start,$request->end);
    return $data;    
  }

 /
    [getSellerQuData 获取商户结算数据 曲线]
    @param [string] $start [起始时间]2017-08
    @param [string] $end  [结束时间]
    @return [type]    [description]
   /
  public function getSellerQuData($name,$start,$end){

    //计算时间差值,以决定格式化时间格式
    $diff = strtotime($end)-strtotime($start);

    //分组条件 1天内按小时分组,否则按天/月分组
    //86400/1天 2678400/1月
    if($diff<86400&&$diff>0){
      $sort = '%H';
    }elseif($diff<2678400){
      $sort = '%Y-%m-%d';
    }else{
      $sort = '%Y-%m';
    }
    //把数据添加时间按格式化时间分组求和,求和分两种,一种是直接求和,一种是满足case when条件的数据求和
    $query = DB::table('user_withdrawals as w')->select(DB::raw("FROM_UNIXTIME(created_at,'{$sort}') as thedata,sum(case when w.cash_type = 1 then w.money end) as xiabi,sum(case when w.cash_type = 2 then w.money end) as online,sum(w.money) as alls"))->groupBy(DB::raw("FROM_UNIXTIME(created_at,'{$sort}')"));

    //条件筛选 某时间段内
    if( !empty($start) ){
      $query->whereRaw('w.created_at >= ?',strtotime($start));
    }
    if( !empty($end) ){
      $query->whereRaw('w.created_at <= ?',strtotime($end));
    }

    $data = $query->get();

    return $data;
  }