Input :: all（）在laravel 5中返回空数组

Question

这是我的ajax请求。我发送请求到控制器删除图片

   $(document).on("click", "button[data-delete]", function(e) {
    var tour_id = $("form").attr("data-tour-id");
    var gallery = {};
    $("input:checkbox[class = checkbox]:checked").each(function(k){
        gallery[k] = $(this).attr("data-gallery-id");
    });
    gallery = JSON.stringify(gallery);
    bootbox.confirm({
        message: "გსურთ აღნიშნული სურათის წაშლა?",
        callback: function(result){ }
    });
    $("button[data-bb-handler='confirm']").on("click",function(){
        $.ajax({
            headers: {'X-CSRF-Token': $('meta[name="csrf_token"]').attr('content')},
            url: "/{lang}/admin/tours/"+ tour_id +"/edit/removeGalleryPic/"+ gallery,
            data : { id: tour_id, pics: gallery },
        }).done(function() {
            window.location.reload();
        });
    });
});

它有效。所以如果请求响应200（ok）页面将被重新加载。但我有另一个表单字段，并在重新加载后，我想保存（闪存）这些字段的值。所以在控制器中我返回输入，但它返回空数组。这是我的控制器

public function removeGalleryPic($id, $pics)
{
    $pics = json_decode($pics, true);
    $tour_whole_gallery = Tour_gallery::where("tour_id", $id)->get();
    if(count($tour_whole_gallery) > 0)
    {
        foreach($tour_whole_gallery as $gallery)
        {
            foreach($pics as $pic_id)
            {
                if($gallery->id == $pic_id)
                {
                    unlink(public_path() . $gallery->path);
                    Tour_gallery::where("id", $pic_id)->delete();
                }
            }
        }
    }
    return Input::all();
}

我应该如何使用他们的数据返回所有输入字段？我也试过这些

$request->all();
$request->flash();
redirect()->back()->withInput();

但结果是一样的。