CCalendar::mergeExcludedDates

static function mergeExcludedDates($currentExDates, $newExDates)
{
	if (is_string($currentExDates))
	{
		$currentExDates = explode(';', $currentExDates);
	}
	if (is_string($newExDates))
	{
		$newExDates = explode(';', $newExDates);
	}

	return implode(';', array_unique(array_merge($currentExDates, $newExDates)));
}