redirect() function doesn't work - php

Question

I have create a web application using CodeIgniter making at first a login interface. Here are the controller I used but I think something doesn't work but I don't know what.The home page, where the user is granted, it doesn't show.Unfortunately I didn't have a debugger to check what doesn't work. maybe there is a problem to handle the session but really I don't know what can be. maybe you are smarther than me to find the error
Login Controller
<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
class Login extends CI_Controller
{
public function __construct()
{
parent::__construct();
$this->load->model('User','user'); /* This call the model to retrieve data from db */
}
public function index()
{
if(!file_exists('application/views/_login.php'))
{
show_404();
}
$this->load->library('form_validation');
$this->form_validation->set_error_delimiters('<h4 style="text-align:center;">','</h4>');
$this->form_validation->set_rules('username','username','trim|required|xss_clean');
$this->form_validation->set_rules('password','password','trim|required|xss_clean|callback_pass_check');
if($this->form_validation->run() == FALSE)
{
/* Data to pass to view */
$data['title'] = "User Access";
$data['author'] = "Salvatore Mazzarino";
$data['year'] = date('Y');
$this->load->view('templates/_header',$data);
$this->load->view('_login',$data);
$this->load->view('templates/_footer',$data);
}
else
{
redirect('home', 'refresh');
}
}
public function pass_check($pass)
{
$result = $this->user->find_user($this->input->post('username'),$pass);
if(!empty($result))
{
foreach ($result as $row)
{
$session_array = array('id'=> $row->id, 'username'=> $row->username); /* Create a session passing user data */
$this->session->set_userdata('logged_in', $session_array);
}
return TRUE;
}
else
{
$this->form_validation->set_message('pass_check',"Invalid username or password!</br>Try again, please!");
return FALSE;
}
}
}
/* END OF FILE */
Home Controller
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Home extends CI_Controller
{
public function __construct()
{
parent::__construct();
session_start();
}
public function index()
{
if($this->session->userdata('logged_in'))
{
$data['title'] = "Management Emergency";
$data['author'] = "Salvatore Mazzarino";
$data['year'] = date('Y');
$this->load->view('templates/_header', $data);
$this->load->view('_home',$data);
$this->load->view('templates/_footer',$data);
}
else
{
redirect('login', 'refresh');
}
}
public function logout()
{
$this->session->unset_userdata('logged_in');
session_destroy();
redirect('home','refresh');
}
}
/* END OF FILE */
The model in the login controller works very well so It isn't a problem of query. Before adding session everything works but when I added session stopped to worked so I think that can be a problem or redirect() or session
Home View
<div data-role = "page">
<div data-role = "header" data-position = "inline">
<?php echo heading($title,1) ?>
</div>
<div class = "menu-content">
<ul data-role = "listview" data-inset="true">
<li data-role = "list-divider">Emergency Menù</li>
<li class = "menu-item">
<a href="">
<div class = "image-wrapper">
<img src="/assets/images/user.png" class = "ui-li-icons" />
</div>
Add patient
</a>
</li>
<li class = "menu-item">
<a href="#">
<div class = "image-wrapper">
<img src="/assets/images/home.png" class = "ui-li-icons" />
</div>
Show all hospital
</a>
</li>
<li class = "menu-item">
<a href="#">
<div class = "image-wrapper">
<img src="/assets/images/favorite.png" class="ui-li-icons" />
</div>
Find patients
</a>
</li>
<li class="menu-item">
<a href="#">
<div class = "image-wrapper">
<img src="/assets/images/email.png" class="ui-li-icons" />
</div>
Send medical infos
</a>
</li>
</ul>
Login View
<div data-role ="dialog">
<div data-role = "header" data-theme="e">
<?php echo heading($title,1) ?>
</div>
<div data-role ="content">
<?php
$var = validation_errors();
if(!empty($var))
{
echo form_error('username');
echo form_error('password');
}
else
{
echo heading('911 - First Aid',2,'style="text-align:center; color:red;"');
echo form_open('login');
?>
<div data-role ="fieldcontain" class="ui-hide-label">
<label for="username">Username:</label>
<input type="text" name="username" id="name" value="" placeholder="Username"/>
</div>
<div data-role ="fieldcontain" class="ui-hide-label">
<label for="password">Password</label>
<input type="password" name="password" id="password" value="" placeholder="Password"/>
</div>
<div data-role ="fieldcontain">
<input type="submit" value="Login" data-theme ="b"/>
</div>
</form>
<?
}
?>

Answer 1

There is a problem with CodeIgniter retaining it's session data after a redirect. Your if($this->session->userdata('logged_in')) in your home.php controller will evaluate false every time because the session is resetting. You could use the native php sessions to skip over this problem.
See: http://codeigniter.com/wiki/Native_session/. Good luck!
UPDATE
Apparently, this is only true of CodeIgniter 1.7.2 when used with IE6. It doesn't affect most browsers.

Answer 2

open the application/config/autoload.php file and add the 'url' in the helper array;
$autoload['helper'] = array('url');
i hope this will help you to fix the problem.