Codeigniter：在自定义库上访问函数的正确方法

Question

I create simple library called Xauth.php to check if user already login or not:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Xauth
{
  protected $ci;

  public function __construct()
  {
    $this->ci =& get_instance();
  }

  public function is_logged_in()
  {
    if ($this->ci->session->userdata('is_logged_in'))
    {
      return true;
    }

    return false;
  }
}

I put that library in my Admin_Controller, so whatever controller extended with Admin_Controller will be checked first, if the session data is empty they will be redirect to login page. And this is my Admin_Controller.php:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Admin_Controller extends MY_Controller {

  public function __construct()
  {
    $this->load->library('Xauth');

    if ($this->Xauth->is_logged_in() == false) {
      redirect('auth');
    }
  }

}

But I got an errors, it says:

Message: Undefined property: Dashboard::$Xauth

Where is my fault?

Answer 1

You must use your class with lowercase letters :

$this->xauth->is_logged_in()