Namespaces help organize code by grouping classes that logically belong together. Autoloading helps in automatically loading classes without manually including them.

// src/Controllers/ExampleController.php
namespace AppControllers;

class ExampleController {
    public function sayHello() {
        return "Hello, World!";
    }
}

// src/Models/ExampleModel.php
namespace AppModels;

class ExampleModel {
    public function getData() {
        return "Data from model.";
    }
}

<?php
require 'vendor/autoload.php';

use AppControllersExampleController;
use AppModelsExampleModel;

$controller = new ExampleController();
echo $controller->sayHello();

$model = new ExampleModel();
echo $model->getData();
?>