Laravel 8：ReflectionException 函数（）不存在

Question

我是一名初学者，正在学习如何使用 Laravel 8。 当我尝试执行我的代码时，我得到了错误：ReflectionException Function() 不存在。

我已经参考了 Laravel 文档#Writing Controllers, #Basic Controllers 部分的语法，但问题无法解决。

造成这个问题的原因是什么以及如何解决？

以下代码是我在 PurchaseController.php 中的控制器部分：

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Routing\Controller as BaseController;


class PurchasesController extends Controller
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    public function index()
    {
        return view('purchases.index');
    }

    public function purchase()
    {
        //
    }

以下部分是我在web.php中的路由

<?php

use Illuminate\Support\Facades\Route;
use App\Http\Controllers\PurchaseController;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/


Route::get('/purchases', [PurchaseController::class], 'index');
Route::post('/purchases', [PurchaseController::class], 'purchase');

Route::get('/', function () {
    return view('welcome');
});

更新： 根据下面提供的答案，我已将我的代码 web.app 代码更改为以下代码。但是，我收到另一条错误消息： Illuminate\Contracts\Container\BindingResolutionException 目标类 [App\Http\Controllers\PurchasesController] 不存在。

<?php

use Illuminate\Support\Facades\Route;
use App\Http\Controllers\PurchasesController;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/


Route::get('/purchases', [PurchasesController::class, 'index']);
Route::post('/purchases', [PurchasesController::class , 'purchase']);

Route::get('/', function () {
    return view('welcome');
});

我更新 PurchaseController.php 代码：

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Routing\Controller as BaseController;


class PurchasesController extends Controller   //Change the naming as suggestion below
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    public function index()
    {
        return view('purchases.index');
    }

    public function purchase()
    {
        //
    }

Answer 1

你应该这样写你的路线：

并将 PurchaseController 更改为 PurchasesController

Route::get('/purchases', [PurchasesController::class, 'index']);
Route::post('/purchases', [PurchasesController::class, 'purchase']);

和

use App\Http\Controllers\PurchasesController;

Answer 2

=> 打开 App\Providers\RouteServiceProvider.php 并取消注释这一行在 laravel 8 中试试这个

受保护的 $namespace = 'App\Http\Controllers';