我正在我的ProfileController.php中开发一个更新配置文件详细信息的函数。我正在验证请求，确保不需要任何内容，但是当我使用filled（）函数时：

if($request->filled('username')){
            $user->username = $request['username'];
        }
        if($request->filled('email')){
            $user->email = $request['email'];
        }
        if($request->filled('profile_description')){
            $user->profile_description = $request['profile_description'];
        }

这不起作用，并且数据库将仅在所有字段都已填充时更新，但个人资料图片除外：

if($request->hasFile('file')){
            if ($request['file']->isValid()) {
                $file = $request['file'];
                $destination = 'images/profile_pictures'.'/';
                $ext= $file->getClientOriginalExtension();
                $mainFilename = $user->username;
                $user->pfp_file_extension = $ext;
                // check if user has existing pfp
                if (File::exists($destination, $mainFilename.".".$user->pfp_file_extension)) {
                    File::delete($destination, $mainFilename.".".$user->pfp_file_extension);
                }
                $file->move($destination, $mainFilename.".".$ext);
            }
        }

由于某种原因，hasFile（）正在工作，因为它允许我不上传图片。
我读过Laravel的文档，它说“验证下的字段在存在时不能为空”，这并没有解释为什么它不工作。

<form method="POST" enctype="multipart/form-data">
                @csrf
                <h6 class="heading-small text-muted mb-4">User information</h6>
                <div class="pl-lg-4">
                  <div class="row">
                    <div class="col-lg-6">
                      <div class="form-group focused">
                        <label class="form-control-label">Username</label>
                        <input type="text" id="username" name="username" class="form-control form-control-alternative" placeholder="{{ Auth::user()->username }}">
                      </div>
                    </div>
                    <div class="col-lg-6">
                      <div class="form-group">
                        <label class="form-control-label">Email address</label>
                        <input type="email" id="email" name="email" class="form-control form-control-alternative" placeholder="{{ Auth::user()->email }}">
                      </div>
                    </div>
                    <div class="col-lg-6">
                      <div class="form-group focused">
                        <label class="form-control-label">Profile Picture</label>
                        <input type="file" class="file" name="file" id="file" accept=".png, .jpg, .jpeg">
                      </div>
                  </div>
                  <div class="row">
  
                  </div>
                </div>
                <hr class="my-4">

    
                <!-- Description -->

                <h6 class="heading-small text-muted mb-4">About me</h6>
                <div class="pl-lg-4">
                  <div class="form-group focused">
                    <label>About Me</label>
                    <textarea id="profile_description" name="profile_description" rows="4" class="form-control form-control-alternative" placeholder="{{ Auth::user()->profile_description }}"></textarea>
                  </div>
                </div>
                <div>
                  <button class="btn btn-sm btn-primary" type="submit">Update Profile</button>
                </div>
              </form>

另外，这里是我的ProfileController.php的全部内容。

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\File; 

class ProfileController extends Controller
{

    public function index()
    {
        return view('profile');
    }
    
    public function profileUpdate(Request $request){
        //validation rules

        $request->validate([
            'username' =>'min:4|unique:users,username|string|max:255',
            'email'=>'unique:users,email|email:filter|max:255',
            'profile_description'=>'string|max:10000',
            'file'=> 'max:10000'
        ]);
        $user = Auth::user();

        if($request->filled('username')){
            $user->username = $request['username'];
        }
        if($request->filled('email')){
            $user->email = $request['email'];
        }
        if($request->filled('profile_description')){
            $user->profile_description = $request['profile_description'];
        }

        if($request->hasFile('file')){
            if ($request['file']->isValid()) {
                $file = $request['file'];
                $destination = 'images/profile_pictures'.'/';
                $ext= $file->getClientOriginalExtension();
                $mainFilename = $user->username;
                $user->pfp_file_extension = $ext;
                // check if user has existing pfp
                if (File::exists($destination, $mainFilename.".".$user->pfp_file_extension)) {
                    File::delete($destination, $mainFilename.".".$user->pfp_file_extension);
                }
                $file->move($destination, $mainFilename.".".$ext);
            }
        }


        
   
        $user->save();
        return back()->with('message','Profile Updated');
    }

    
}

先谢谢你。