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// 定义一个路由
Route::get('/user/{id}', function ($id) {
    $user = User::find($id);
    return view('user', ['user' => $user]);
});

// 数据库操作
$user = new User;
$user->name = 'John Doe';
$user->email = 'john@example.com';
$user->save();

// 定义一个路由
use SymfonyComponentRoutingAnnotationRoute;

class UserController
{
    /**
     * @Route("/user/{id}", name="user_show")
     */
    public function show($id)
    {
        $user = $this->getDoctrine()->getRepository(User::class)->find($id);
        return $this->render('user/show.html.twig', ['user' => $user]);
    }
}

// 数据库操作
$user = new User();
$user->setName('John Doe');
$user->setEmail('john@example.com');

$entityManager = $this->getDoctrine()->getManager();
$entityManager->persist($user);
$entityManager->flush();

// 定义一个路由
$route['user/(:num)'] = 'user/show/$1';

// 控制器
class User extends CI_Controller {
    public function show($id) {
        $this->load->model('user_model');
        $user = $this->user_model->get_user($id);
        $this->load->view('user', ['user' => $user]);
    }
}

// 数据库操作
class User_model extends CI_Model {
    public function get_user($id) {
        return $this->db->get_where('users', ['id' => $id])->row();
    }
}