CI_Session::_configure PHP Method

    protected function _configure(&$params)
    {
        $expiration = config_item('sess_expiration');
        if (isset($params['cookie_lifetime'])) {
            $params['cookie_lifetime'] = (int) $params['cookie_lifetime'];
        } else {
            $params['cookie_lifetime'] = !isset($expiration) && config_item('sess_expire_on_close') ? 0 : (int) $expiration;
        }
        isset($params['cookie_name']) or $params['cookie_name'] = config_item('sess_cookie_name');
        if (empty($params['cookie_name'])) {
            $params['cookie_name'] = ini_get('session.name');
        } else {
            ini_set('session.name', $params['cookie_name']);
        }
        isset($params['cookie_path']) or $params['cookie_path'] = config_item('cookie_path');
        isset($params['cookie_domain']) or $params['cookie_domain'] = config_item('cookie_domain');
        isset($params['cookie_secure']) or $params['cookie_secure'] = (bool) config_item('cookie_secure');
        session_set_cookie_params($params['cookie_lifetime'], $params['cookie_path'], $params['cookie_domain'], $params['cookie_secure'], TRUE);
        if (empty($expiration)) {
            $params['expiration'] = (int) ini_get('session.gc_maxlifetime');
        } else {
            $params['expiration'] = (int) $expiration;
            ini_set('session.gc_maxlifetime', $expiration);
        }
        $params['match_ip'] = (bool) (isset($params['match_ip']) ? $params['match_ip'] : config_item('sess_match_ip'));
        isset($params['save_path']) or $params['save_path'] = config_item('sess_save_path');
        $this->_config = $params;
        // Security is king
        ini_set('session.use_trans_sid', 0);
        ini_set('session.use_strict_mode', 1);
        ini_set('session.use_cookies', 1);
        ini_set('session.use_only_cookies', 1);
        ini_set('session.hash_function', 1);
        ini_set('session.hash_bits_per_character', 4);
    }