laravel excel循环导出

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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');
        
    }