我在localhost中有一个codeigniter（版本2.2.6）应用程序 .
我正在尝试登录用户 .
我使用数据库来存储会话 .
config.php中的session配置
$config['sess_cookie_name'] = 'myapp';
$config['sess_expiration'] = 0;
$config['sess_expire_on_close'] = TRUE;
$config['sess_encrypt_cookie'] = TRUE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name'] = 'myapp_sessions';
$config['sess_match_ip'] = TRUE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;
并且它有效，它将用户数据保存在数据库中
$userdata = array(
'user_id' => $result['id'],
'username' => $result['username'],
'is_admin' => $result['is_admin'],
'logged_in' => TRUE
);
$this->session->set_userdata($userdata);
BUT, when i try to retrieve data it gives me NULL;
$this->session->userdata('username');
有任何想法吗？
EDIT:
请求：var_dump（$ this-> session-> all_userdata（））;
array(4) {
["session_id"]=>
string(32) "767eab3e9539d0bdc29faeb48ad86919"
["ip_address"]=>
string(9) "127.0.0.1"
["user_agent"]=>
string(110) "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36"
["last_activity"]=>
int(1455306997)
}