php – 在CodeIgniter 3.1.2中重定向后会话数据丢失

这是我的登录脚本

public function login(){

    if(!empty($_SESSION['user_id'])){//Meaning you are logged in
        //We inform you
        $this->session->set_flashdata('msg',"<div class='alert alert-success'><span class=''></span> You are already logged in as <strong>".$this->session->user_name."</strong></div>");

        //And send you back to your dashboard
        return redirect('/account/dashboard');
    }

    if($this->input->post()){
    $this->load->library('form_validation');
    $this->form_validation->set_rules('email','Email','required|valid_email');
    $this->form_validation->set_rules('password','Password','required');

        if($this->form_validation->run() == TRUE){

            $creds=['email'=>$this->input->post('email'),'password'=>$this->input->post('password')];
            $this->load->model('user/user_model');

            $user=$this->user_model->login($creds);

            if(!$user){
                $data['error_msg']="Inavlid login details. Please retry";
            }else{

            $user->user_type=(!empty($user->user_type))?:'2';

                $userdata=['user_id'=>$user->id,'user_name'=>$user->name,'user_email'=>$user->email,'user_type'=>$user->user_type];

                $this->session->set_userdata($userdata);
                    $this->session->set_flashdata('msg','<div class="alert alert-success"><span class="fa fa-check"></span> Logged in as '.$this->session->userdata('user_name').'</div>');

                return redirect('account/dashboard');
            }

        }
    }

    $data['title']="Login";
    $this->load->view('template/auth/header');
    $this->load->view('account/login',$data);
    $this->load->view('template/auth/footer');

}

这是我的config / congig.php文件

$config['base_url'] = 'http://localhost/tmpad/';

$config['allow_get_array'] = TRUE;
$config['enable_query_strings'] = FALSE;
$config['controller_trigger'] = 'c';
$config['function_trigger'] = 'm';
$config['directory_trigger'] = 'd';

$config['encryption_key'] = '4%^&*9799809-nkhdfioup';

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

$config['cookie_prefix']    = '';
$config['cookie_domain']    = 'http://localhost/tmpad/';
$config['cookie_path']      = '/';
$config['cookie_secure']    = FALSE;
$config['cookie_httponly']  = FALSE; 

$config['csrf_protection'] = TRUE;
$config['csrf_token_name'] = 'csrf_test_name';
$config['csrf_cookie_name'] = 'csrf_cookie_name';
$config['csrf_expire'] = 7200;
$config['csrf_regenerate'] = TRUE;
$config['csrf_exclude_uris'] = array();

session在config / autoload.php中自动加载

我将不胜感激任何指导或帮助.
谢谢