<?php

class AuthController extends BaseController {

    public function login()
    {
        $this->output['error'] = isset($this->params['error']) ? $this->params['error'] : null;
        $this->output['register'] = isset($this->params['register']) ? $this->params['register'] : null;
        $this->output['templatePath'] = APP_PATH . 'templates/login.php';
    }

    public function doLogin()
    {
        if (isPost()) {

            $user = new User();
            $user->read('email', $_POST['email']);

            $expectedPassword = md5($_POST['password'] . User::PASSWORD_APPEND);

            if ($user->password === $expectedPassword){
                $user->login();
                redirect('/index.php');
            } else {
                redirect('/index.php?page=login&error=1');
            }
        } else {
            redirect('/index.php?page=login&error=2');
        }
    }

    public function doLogout()
    {
        User::logout();
        redirect('/index.php');
    }

    public function register()
    {

        $error = false;

        if (isPost()){

            if (empty($_POST['name'])){
                $error = 'Insert name';
            } elseif (filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) === false){
                $error = 'Invalid email address';
            } elseif (User::emailExists($_POST['email'])){
                $error = 'Email already exists';
            }

            if (!$error){
                $user = new User();
                $user->name = $_POST['name'];
                $user->email = $_POST['email'];
                $user->password = md5($_POST['password'] . User::PASSWORD_APPEND);
                $user->type = 'user';
                $user->save();
                redirect('/index.php?page=login&register=1');
            }

            $this->output['post'] = $_POST;

        }

        $this->output['registerError'] = $error;
        $this->output['templatePath'] = APP_PATH . 'templates/register.php';
        $this->output['register'] = true;
    }
}

<?php
class BaseController {
    protected $params, $output;

    public function __construct($params = array())
    {
        $this->params = $params;
        $this->output = array();
    }

    public function getOutput()
    {
        return $this->output;
    }
}

<?php

class HomeController extends BaseController {

    public function index()
    {
        $p = isset($this->params['p']) ? $this->params['p'] : 1;

        $articlePerPage = 2;
        $limitStart = ($p-1)*$articlePerPage;

        $articles = Article::getAll(
            "WHERE status = 'published' ORDER by date_published DESC
            LIMIT {$limitStart},{$articlePerPage}
            "
        );

        $this->output['p'] = $p;
        $this->output['articles'] = $articles;
        $this->output['templatePath'] = APP_PATH . 'templates/home.php';
    }
}

<?php

class NotFoundController extends BaseController {

    public function __construct($params)
    {
        parent::__construct($params);
        $this->output['templatePath'] = APP_PATH . 'templates/components/not-found.php';
        $this->output['pageNotFound'] = true;
    }
}

index.php
<?php

require_once 'application/init.php';

session_start();

$params = $_REQUEST;

$controllerName = isset($_GET['page']) ? $_GET['page'] : 'home';
$actionName = isset($_GET['action']) ? $_GET['action'] : 'index';

$controller = null;
switch($controllerName) {
    case 'auth':
        $controller = new AuthController($params);
        break;
    case 'home':
        $controller = new HomeController($params);
        break;
}

if($controller != null && method_exists($controller, $actionName)){
    $controller->{$actionName}();
} else {
    $controller = new NotFoundController($params);
}

$TEMPLATE_VARS = array(
    'pageNotFound' => false,
    'userIsLogged' => User::isLogged()
);

$TEMPLATE_VARS = array_merge($TEMPLATE_VARS, $controller->getOutput());

/*if (file_exists($pagePath)){
    require_once $pagePath;

} else {
    $TEMPLATE_VARS['templatePath'] = APP_PATH . 'templates/components/not-found.php';
    $TEMPLATE_VARS['pageNotFound'] = true;
}*/

require_once APP_PATH . 'templates/components/main.php';