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$arGroups_db = CUser::GetUserGroupList( $user_id );

      while ($arGroup = $arGroups_db->Fetch()){
         $arGroups[] = $arGroup;
      }
      // $arGroups[] = 5;
      if($days) {
         $arGroups[] = array(
            'GROUP_ID' => 5,
              'DATE_ACTIVE_FROM'=>'01.10.2016',
              'DATE_ACTIVE_TO'=>'02.11.2016'
         );
      }
      

      // var_dump($arGroups);
      return CUser::SetUserGroup($user_id, $arGroups);