Codeigniter session removed after redirect

Question

I have an strange problem with (latest) Codeigniter. I use the session class for my login. After login i store some userdata in the session.

I developed my application local and the login works fine. When the application was finished , i uploaded it to my webserver http://mijn.exova.nl/ . The application worked fine for a day. But a day later the session are not stored after the login. I uploaded the code again from local but the problem still exist. Before the redirect the session still exist. After the redirect the session is empty.

Code:

Config settings session (are default)

$config['sess_cookie_name']     = 'ci_session';
$config['sess_expiration']      = 7200;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = FALSE;
$config['sess_use_database']    = FALSE;
$config['sess_table_name']      = 'ci_sessions';
$config['sess_match_ip']        = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;
$config['cookie_prefix']        = "";
$config['cookie_domain']    = "";
$config['cookie_path']  = "/";
$config['cookie_secure']    = FALSE;

Creation session (in library)

$this->CI->session->set_userdata('exova_login', true);
$this->CI->session->set_userdata('exova_userdata', $userdata);
$this->CI->session->set_userdata('exova_rollen', $rollen);
$this->CI->session->set_userdata('exova_school', $school);

Redirect (before session is oke, after the session is empty)

redirect(base_url());

Does somebody know why this problem occured? Thanks!

Answer 1

It works again! The exact problem is unknown but when i removed all browser data it works again. I learned that it is very importend to set session not twice. I solved it by adding this:

if($this->CI->session->userdata('exova_login') == false){

arround the session set. Session will never be set twice and that ensured that problems like these can be avoided. Thanks for the comments.