从codeigniter库调用模型显示错误

Question

Hello I have created a library Auth.php in application/libraries to authenticate if the current user is logged in or not. So my controller is :

$session_data = $this->session->userdata('logged_in');
$this->load->library('Auth');
$auth = new Auth;
$user_id = $auth->authenticate($session_data);

And the library :

class Auth{
    function authenticate($vars){

        $CI =&get_instance();
        $CI->load->model('adminmodels/login_model');

        $username = $vars['username'];
        $password = $vars['password'];
        $user_id = $vars['user_id'];;
        $user_type = $vars['user_type'];

        $check_login = $this->login_model->login($username,$password); //Line 14

        if($check_login){
            $user_id = $user_id;
        }else{
            $user_id = 0;
        }

        return $user_id;
   }
}

But it is showing error like :

A PHP Error was encountered

Severity: Notice

Message: Undefined property: Auth::$login_model

Filename: libraries/Auth.php

Line Number: 14

Whats wrong I am doing ??

Answer 1

While correct generally, in CI you should call the library like this, not with the new keyword:

$this->load->library('Auth');
$user_id = $this->auth->authenticate($session_data);

Also, since you assigned the global CI object to a variable, you can't use $this to refer to it:

    $check_login = $this->login_model->login($username,$password); //Line 14

should be:

    $check_login = $CI->login_model->login($username,$password); //Line 14

(since you loaded the model there: $CI->load->model('adminmodels/login_model'); )