public function getOfflineNonChatMembers($id)
 {
     $chatroom_members_id = array();
     $online_nonchat_members_id = array();
     $chatroom_members_id = ChatRoomMember::getChatMembersIds($id);
     $online_nonchat_members_id = $this->getOnlineNonChatMembersIds($id);
     if (!is_null($online_nonchat_members_id) && !is_null($chatroom_members_id)) {
     }
     $data = array_merge($chatroom_members_id, $online_nonchat_members_id);
     $total_member_ids = UserPeer::getTotalMemberIds();
     $offline_nonchat_members_id = array_diff($total_member_ids, $data);
     if ($offline_nonchat_members_id) {
         return UserPeer::getMemberDetailsFromIds($offline_nonchat_members_id);
     }
 }