public static function destroy_all()
 {
     if (!current_user_can('frm_delete_entries')) {
         $frm_settings = FrmAppHelper::get_settings();
         wp_die($frm_settings->admin_permission);
     }
     global $wpdb;
     $params = FrmForm::get_admin_params();
     $message = '';
     $errors = array();
     $form_id = (int) $params['form'];
     if ($form_id) {
         $entry_ids = FrmDb::get_col('frm_items', array('form_id' => $form_id));
         $action = FrmFormAction::get_action_for_form($form_id, 'wppost', 1);
         if ($action) {
             // this action takes a while, so only trigger it if there are posts to delete
             foreach ($entry_ids as $entry_id) {
                 do_action('frm_before_destroy_entry', $entry_id);
                 unset($entry_id);
             }
         }
         $wpdb->query($wpdb->prepare("DELETE em.* FROM {$wpdb->prefix}frm_item_metas as em INNER JOIN {$wpdb->prefix}frm_items as e on (em.item_id=e.id) and form_id=%d", $form_id));
         $results = $wpdb->query($wpdb->prepare("DELETE FROM {$wpdb->prefix}frm_items WHERE form_id=%d", $form_id));
         if ($results) {
             FrmEntry::clear_cache();
             $message = __('Entries were Successfully Destroyed', 'formidable');
         }
     } else {
         $errors = __('No entries were specified', 'formidable');
     }
     self::display_list($message, $errors);
 }