CI3.0使用DB driver 當session

config\config.php 設定

$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = NULL;
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name'] = 'ci_sessions';


DB設定，使用mysql
CREATE TABLE `ci_sessions` (
  `id` varchar(40) NOT NULL,
  `ip_address` varchar(45) NOT NULL,
  `timestamp` int(11) NOT NULL,
  `data` blob NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

ALTER TABLE `ci_sessions`
  ADD PRIMARY KEY (`id`), ADD KEY `ip_address` (`ip_address`);


controller 初始化

 public function __construct()
 {
  parent::__construct();
  $this->load->driver('session');
 }


$this->session->userdata('item');  讀取session
$this->session->set_userdata('some_name', 'some_value');  設定session
$this->session->unset_userdata('some_name');  刪除session