How does Laravel handle class usage without explicitly declaring the class with the "use" keyword in the file?

When using a class in Laravel without explicitly declaring it with the "use" keyword, Laravel's autoloader will attempt to resolve the class using the PSR-4 autoloading standard. This means that Laravel will look for the class within the directory structure defined in the composer.json file. To solve this issue, ensure that the class namespace matches the directory structure and that the class file is located in the correct directory.

// Example of using a class without explicitly declaring it with the "use" keyword in Laravel

// File: app/Models/User.php
namespace App\Models;

class User {
    // Class implementation
}

// File: app/Http/Controllers/UserController.php
namespace App\Http\Controllers;

class UserController extends Controller {
    public function index() {
        $user = new \App\Models\User(); // Class is used without "use" keyword
        // Controller logic
    }
}