CodeIgniter sessions vs PHP sessions

In my experience with CI I’ve encountered some anomalies with its sessions, but for most day-to-day needs the library is good and easy to work with. As it was pointed out, Flashdata is a very nice feature.

If you choose to stay with CI’s sessions, I’d strongly suggest to store sessions in a database and, additionally, encrypt cookies:

$config['sess_encrypt_cookie'] = TRUE;
$config['sess_use_database']   = TRUE;
$config['sess_table_name']     = 'sessions';

The database structure should be as follows:

CREATE TABLE IF NOT EXISTS  `sessions` (
    session_id varchar(40) DEFAULT '0' NOT NULL,
    ip_address varchar(16) DEFAULT '0' NOT NULL,
    user_agent varchar(50) NOT NULL,
    last_activity int(10) unsigned DEFAULT 0 NOT NULL,
    user_data text NOT NULL,
    PRIMARY KEY (session_id)
);