unable destroy session in codeigniter - php

Question

What I want to implement is a simple login page, if user login successfully, then redirect to main page, else remain login page.
I have 1 controller named login, and 1 model named main.
When user click the login button, the login/login_send will be called.
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Login extends CI_Controller{
function __construct() {
parent::__construct();
$this->load->model('model_login');
}
function index()
{
if ($this->model_login->is_logged_in())
{
redirect('main');
}
else
{
// load login page
$data['main'] = 'view_login';
$data['style'] = 'style_login';
$this->load->view('template', $data);
}
}
function login_send()
{
$this->form_validation->set_rules('username', 'Username', 'trim|required');
$this->form_validation->set_rules('password', 'Password', 'trim|required');
if ($this->form_validation->run() == FALSE)
{
$this->index();
}
else
{
if ( $this->model_login->validate_user() )
{
$user_session_data = array(
'username' => $this->input->post('username'),
'is_logged_in' => 1
);
$this->session->set_userdata($user_session_data);
redirect('main');
}
else
{
redirect('login');
}
}
}// end function login_send
function logout()
{
if ($this->model_login->is_logged_in())
{
$this->session->sess_destroy();
$this->session->set_userdata(array('username' => '', 'is_logged_in' => 0));
log_message('debug', 'Some variable was correctly set');
}
redirect('login','refresh');
}
}// end class Login
?>
Model_login here is just to help to verify if user is logged in, by check the session data.
<?php
class Model_login extends CI_MOdel{
function _isUserExist($username, $password)
{
$options = array(
'UserName' => $username,
'Password' => $password
);
$query = $this->db->get_where('userinfo', $options);
return $query->num_rows() > 0;
}
function validate_user()
{
$username = $this->input->post('username');
$password = $this->input->post('password');
return ($this->_isUserExist($username, $password));
}
function is_logged_in()
{
$is_logged_in = $this->session->userdata('is_logged_in');
if ( !isset($is_logged_in) || $is_logged_in != 1 ) return FALSE;
else return TRUE;
}
}// end class model_login
?>
When first time login, and then logout, there is no problem. However, if I login second time, I can not log out. Even the login/logout was called correctly, I also refreshed the page, but the session['is_logged_in'] == 1. Something wrong with my code?

Answer 1

In your application/config/config.php try changing
$config['sess_time_to_update'] = 300; //This is the default setting in ver 2.1.1
to
$config['sess_time_to_update'] = 0;
This gave me some problems a few years back