Class Controller not found in laravel 4 - php

Question

I'm beginner in Laravel and when I'm trying to use Controller I'm getting this error
Illuminate\Contracts\Container\BindingResolutionException
Target class [PostsController] does not exist.
http://127.0.0.1:8000/posts
routes directory contain web.php to route and there I'm using
Route::get('/posts', 'PostsController#index');
to redirect to the class PostsController
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
class PostsController extends Controller
{
public function index() {
echo "asdas";
}
}

Answer 1

Before diving into your problem, you should really not use Laravel 4. We are almost at version 9.
Laravel 4 lacks features, security fixes and current PHP versions support (yes, at the time of this writing, all versions < 7 shouldn't be used).
That being said, you probably have a good reason, like working on a legacy project that's hard to update.
What you could do is to use the fully qualified namespace inside your route file.
Route::get('/posts', '\App\Http\Controllers\PostsController#index');
Also, triple check that you are using Laravel 4. The problem you have could also be caused by one of the latest Laravel update (version 8) where the default namespace was removed from the App\Providers\RouteServiceProvider file.
If you made a mistake and you are on Laravel 8, then just use the following notation:
Route::get('/posts', [\App\Http\Controllers\PostsController::class,'index']);
[EDIT]
As mentioned in the comments, you could also uncomment // protected $namespace = 'App\\Http\\Controllers'; in your route file. Of course, this apply to Laravel 8 so if you are on Laravel 4, just ignore this edit.