laravel实现按月或天或小时统计mysql数据

/**
* [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;
}