Home::login PHP Method

    public function login()
    {
        $data['no_cache'] = TRUE;
        if ($this->session->userdata('last_check')) {
            $last_check = time() - $this->session->userdata('last_check');
            if ($last_check < 3) {
                sleep(2);
            }
        }
        $this->session->set_userdata('last_check', time());
        $this->load->library('form_validation');
        $this->form_validation->set_rules('username', 'lang:lang_username', 'required');
        $this->form_validation->set_rules('password', 'lang:lang_password', 'required');
        $this->form_validation->set_error_delimiters('<p>', '</p>');
        $this->template->set_layout(FALSE);
        if ($this->form_validation->run() == false) {
            $this->template->build('admin/login', $data);
        } else {
            $username = $this->input->post('username');
            $password = $this->input->post('password');
            $remember = $this->input->post('remember');
            $login = $this->users_auth->login($username, $password, $remember);
            if ($login !== TRUE) {
                $data['error'] = $login;
                $this->template->build('admin/login', $data);
            } else {
                $this->users_auth->redirect(TRUE);
            }
        }
    }

 /**
  * "Start" the application:
  * Analyze the URL elements and calls the according controller/method or the fallback
  */
 public function __construct()
 {
     // create array with URL parts in $url
     $this->getUrlWithoutModRewrite();
     // check for controller: no controller given ? then load start-page
     if (!$this->url_controller) {
         require APP . 'controllers/home.php';
         $page = new Home();
         $page->login();
     } elseif (file_exists(APP . 'controllers/' . $this->url_controller . '.php')) {
         // here we did check for controller: does such a controller exist ?
         // if so, then load this file and create this controller
         // example: if controller would be "car", then this line would translate into: $this->car = new car();
         require APP . 'controllers/' . $this->url_controller . '.php';
         $this->url_controller = new $this->url_controller();
         // check for method: does such a method exist in the controller ?
         if (method_exists($this->url_controller, $this->url_action)) {
             if (!empty($this->url_params)) {
                 // Call the method and pass arguments to it
                 call_user_func_array(array($this->url_controller, $this->url_action), $this->url_params);
             } else {
                 // If no parameters are given, just call the method without parameters, like $this->home->method();
                 $this->url_controller->{$this->url_action}();
             }
         } else {
             if (strlen($this->url_action) == 0) {
                 // no action defined: call the default index() method of a selected controller
                 $this->url_controller->index();
             } else {
                 // defined action not existent: show the error page
                 require APP . 'controllers/error.php';
                 $page = new Error();
                 $page->index();
             }
         }
     } else {
         require APP . 'controllers/error.php';
         $page = new Error();
         $page->index();
     }
 }