EGroupware / egroupware

		if ($change_since !== false)

		{

			// find all existing recurrences

			foreach($this->db->select($this->user_table,'DISTINCT cal_recur_date',$where,__LINE__,__FILE__,false,'','calendar') as $row)

			{

				$recurrences[] = $row['cal_recur_date'];

			}

			// update existing entries

			$existing_entries = $this->db->select($this->user_table,'*',$where,__LINE__,__FILE__,false,'ORDER BY cal_recur_date DESC','calendar');

			$where[] = '(cal_recur_date = 0 OR (cal_recur_date >= ' . (int)$start .

						' AND cal_recur_date <= ' . (int)$end . '))';

		}

		foreach($this->db->select($this->user_table,'DISTINCT cal_recur_date',$where,__LINE__,__FILE__,false,'','calendar') as $row)

		{

			// inititalize the array

			$participant_status[$row['cal_recur_date']] = null;

		}

		if (is_null($uid)) return $participant_status;

		$user_type = $user_id = null;

		self::split_user($uid, $user_type, $user_id, true);