laravel excel循环导出

public function exportExcel(){ 
        Excel::create("订单统计".date("Y-m-d H_i_s"), function ($excel) {
            $excel->sheet("order", function ($sheet) {
                
                    $data = Orders::where("type",2)->orderby("id","desc")->get(); //要用get()
                    $sheet->appendRow(["老师姓名","联系方式","老师性别"]);//这里是表头的名称
                    foreach($data as $o){ //appendRow是导出一行，要导出数据表就要循环这个
                        $sheet->appendRow([$o->teacher_name,(string)$o->teacher_mobile,$o->teacher_sex]);//进行循环
                    }
                

            });
        })->download("csv");
        
    }