CodeIgniter Session Userdate seems not to exists - session

Question

I'm coding my first CI project and try to write a loginscript. Everything works almost fine, except that the session userdata is not available (even not if i check my cookies / sessions in Firefox).
I don't understand why the session userdata only are available after login, but if i load the same page again (not a refresh, but a new load) i would expect i still will be logged in, but i'm logged out ? Even if i try to read the session userdata it doesn't exists.
I simplified my script to an example version for stackoverflow. Who can tell me how this session issue can be solved?
Regards,
Guido
<?php
class Test extends CI_Controller
{
function index()
{
$logged_in = $this->is_logged_in();
if($logged_in) {
echo "You are logged in. <a href='test/logout'>Logout</a> | <a href='../'>Return to index</a>";
}
else {
echo "You are logged out";
echo form_open('test/check_login');
echo "Email: ".form_input('email', set_value('email'));
echo "Password: ".form_password('password', set_value('password'));
echo form_submit('submit','Login');
echo form_close();
}
}
function is_logged_in() // check if user has logged in
{
// AUTOLOAD SESSIONS HAS SET in autoload.php-config >> $autoload['libraries'] = arra y('database', 'session', 'email');
$is_logged_in = $this->session->userdata('is_logged_in');
if($is_logged_in) {
return TRUE;
}
else {
return FALSE;
}
}
function check_login()
{
$client_id = $this->validate();
if(is_numeric($client_id)) // if the user's credentials validated then user exists
{
$data = array(
'client_id' => $client_id,
'is_logged_in' => true
);
$this->session->set_userdata($data);
}
$this->index();
}
// normally we put this function in a model, but for this example we put it here.
function validate() // check if user exists in database
{
$this->db->where('email', $this->input->post('email'));
$this->db->where('password', md5($this->input->post('password')));
$query = $this->db->get('client_users'); // this is our user table
if($query->num_rows == 1) // user exists
{
$row = $query->row();
return $row->id_client;
}
else
{
return false;
}
}
function logout()
{
$this->session->sess_destroy(); // kill session, so user will be logged out.
redirect('/test');
}
}
?>

Answer 1

Your validate function's if statement should read:
if($query->num_rows() == 1) // user exists
You left out the () after num_rows.
Edit: After further review, that shouldn't matter. The only other thing I can tell is maybe your result is not equal to 1. Either the user isn't found or you're getting more than one result, both resulting in !== 1.