例如：
$order = DB::table('third_orders')->select(DB::raw('count(*) as count_order, sum(order_price) as count_price'))
->where(['third_key' => $third_key])->get()->sum('order_price');
或者：
$order = DB::table('third_orders')->where(['third_key' => $third_key])->count();//总订单数
// $price = DB::table('third_orders')->where(['third_key' => $third_key])->sum("order_price");//总价格
