codeigniter会话在几天后自动注销。my config.php值：

$config['sess_driver'] = 'files'
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 100000000;
$config['sess_save_path'] = APPPATH . 'sessions/';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;

codeigniter版本=3.1.11
php版本=7.4.20