codeigniter - $this->session->unset_userdata not working? -

so have login method:

public function login(){     $this->form_validation->set_rules('username','username','trim|required|min_length[4]|xss_clean');     $this->form_validation->set_rules('password','username','trim|required|min_length[4]|xss_clean');      if($this->form_validation->run()== false) {          //loading view         $this->load->view('admin/layouts/login');           $username = $this->input->post('username');         $password = $this->input->post('password');          //validate username & password         $user_id = $this->authenticate_model->login($username, $password);          if($user_id){             $user_data = array(                 'user_id' => $user_id,                 'username' => $username,                 'logged_in' => true             );              //set session userdata             $this->session->set_userdata($user_data);         } else {             //set message             $this->session->set_flashdata('pass_login', 'you logged in');             redirect('admin/dashboard');         }     } } 

and use simple method logout:

public function logout(){     //unset user data     $this->session->unset_userdata('user_id');     $this->session->unset_userdata('username');     $this->session->unset_userdata('logged_in');     $this->session->sess_destroy();      redirect('admin/authenticate/login'); } 

so i'm unsetting sessions userdata , redirecting login controller. , happens is, when redirect login page, automatically login again, if session data still valid , present. why it's happening?

you try

unset($this->session->userdata('user_id')); unset($this->session->userdata('logged_in')); unset($this->session->userdata('username')); 

or have

$this->session->sess_destroy(); 

make sure session library auto loaded , have configured settings depending on version of codeigniter