CodeIgniter Create account method

gistfile1.txt

 public function create_account() {
  // Check the session. Same as before.
    if ($this->session->userdata('logged_in')) {
    $session_data = $this->session->userdata('logged_in');
	      } else { redirect('login', 'refresh'); }
	
	      // Set initial state of the form in the create_account view.
	      $data['message'] = "Create a New Admin Account";

	      // Check if the form has submitted.
	      if (isset($_POST['username']) && isset($_POST['password'])) {
	
	         // load the user model
	         $this->load->model('user');
	         
	         // call the models "create_account" function with the form data.
	         $account = $this->user->create_account($_POST['username'], $_POST['password']);
	
	         // On error, report the error.
	         if (!$account) { $data['message'] = "This account already exists: " . $_POST['username']; }
	
	         // report successful account creation  to the view.
	         else { $data['message'] = "Successfully created new admin account: ".$_POST['username']; }
	      }
	
	      // load the view elements
	      $this->load->view('header');
	      $this->load->view('console', $session_data);
	      $this->load->view('configure');
	      $this->load->view('create_account', $data);
  }