public function logout()
 {
     unset_userdata('resource_access');
     unset_userdata('session_admin');
     unset_userdata("user_level");
     unset_userdata("admin_id");
     unset_userdata('access');
     unset_all_userdata();
     redirect("admin/user/login");
 }
 public function logout()
 {
     unset_all_userdata();
     redirect('home');
 }