public function admin_membership_levels()
 {
     include_once SIMPLE_WP_MEMBERSHIP_PATH . 'classes/class.swpm-membership-levels.php';
     $levels = new SwpmMembershipLevels();
     $level_action = filter_input(INPUT_GET, 'level_action');
     $action2 = filter_input(INPUT_GET, 'action2');
     $action = $level_action ? $level_action : ($action2 ? $action2 : "");
     switch ($action) {
         case 'add':
         case 'edit':
             $levels->process_form_request();
             break;
         case 'manage':
             $levels->manage();
             break;
         case 'category_list':
             $levels->manage_categroy();
             break;
         case 'delete':
             $levels->delete();
         default:
             $levels->show();
             break;
     }
 }
 public function admin_membership_levels_menu()
 {
     include_once SIMPLE_WP_MEMBERSHIP_PATH . 'classes/class.swpm-membership-levels.php';
     $levels = new SwpmMembershipLevels();
     $levels->handle_main_membership_level_admin_menu();
 }