best way to store session in codeigniter

Question

I want use session in my website but I can't find best way to store them, codeigniter offers files, database and so on. but which is best??

I use file with this config:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 0;
$config['sess_save_path'] = '_s';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 0;
$config['sess_regenerate_destroy'] = FALSE;

but i get this error:

Unable to create file ./_s\ci_sessionecc1dccdd1118e02ee956dde8aadaf7f1116c1ac because No such file or directory

I must use database ??

Answer 1

I find the best way is to create a cache/session/ folder in your systems directory is more safer I put important things like logs and cache in system rather than application folder.

http://www.codeigniter.com/user_guide/libraries/sessions.html

Config.php

$config['encryption_key'] = 'somekey';

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = BASEPATH . 'cache/sessions/';
$config['sess_match_ip'] = TRUE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;

I also would autoload sessions my self

application/config/autoload.php

$autoload['libraries'] = array('database', 'session');

Usage Example

On login form_validation success part

$data = array(
'is_logged' => true,
'username' => $this->input->post('username')
);

$this->session->set_userdata($data);

One you set your data then after login can get sessions $this->session->userdata('username') etc