我打算將“annonces\ August2020 \ image.jpg”之類的圖像鏈接插入到數(shù)據(jù)庫(kù)和存儲(chǔ)中的圖像中，但它給了我錯(cuò)誤未定義的變量：插入。文件控制器.phppublic function save(Request $request)    {       request()->validate(['file'  => 'required|mimes:doc,docx,pdf,txt,jpeg,jpg|max:2048',]);       if ($files = $request->file('fileUpload')) {           $destinationPath = 'public/file/'; // upload path           $profilefile = date('YmdHis') . "." . $files->getClientOriginalExtension();           $files->move($destinationPath, $profilefile);           $insert['file'] = "$profilefile";        }        $check = Document::insertGetId($insert);        return Redirect::to("file")        ->withSuccess('Great! file has been successfully uploaded.');    }文件.balde.php<form action="/save" method="post" enctype="multipart/form-data">                @csrf                <div class="form-group">                    <input type="file" class="form-control-file" name="file" id="file" aria-describedby="fileHelp">                    <small id="fileHelp" class="form-text text-muted">Please upload a valid image file. Size of image should not be more than 2MB.</small>                </div>                <button type="submit" class="btn btn-primary">Submit</button>            </form>網(wǎng)頁(yè).phpRoute::get('file', 'fileController@index');Route::post('save', 'fileController@save');