CTaskTemplates::parseReplicationParams

static function parseReplicationParams(array $params = []): array
{
	// todo: use BitrixTasksItemTaskTemplateFieldReplicateParams::createValueStructure() here

	$allowed = [
		'PERIOD' => true,
		'EVERY_DAY' => true,
		'WORKDAY_ONLY' => true,
		'EVERY_WEEK' => true,
		'WEEK_DAYS' => true,
		'MONTHLY_TYPE' => true,
		'MONTHLY_DAY_NUM' => true,
		'MONTHLY_MONTH_NUM_1' => true,
		'MONTHLY_WEEK_DAY_NUM' => true,
		'MONTHLY_WEEK_DAY' => true,
		'MONTHLY_MONTH_NUM_2' => true,
		'YEARLY_TYPE' => true,
		'YEARLY_DAY_NUM' => true,
		'YEARLY_MONTH_1' => true,
		'YEARLY_WEEK_DAY_NUM' => true,
		'YEARLY_WEEK_DAY' => true,
		'YEARLY_MONTH_2' => true,
		'START_DATE' => true,
		'END_DATE' => true,
		'TIME' => true,
		'TIMEZONE_OFFSET' => true,
		'DAILY_MONTH_INTERVAL' => true,
		'REPEAT_TILL' => true,
		'TIMES' => true,
		'NEXT_EXECUTION_TIME' => true,
	];
	foreach ($params as $fld => $value)
	{
		if (!($allowed[$fld] ?? null))
		{
			unset($params[$fld]);
		}
	}

	$params['EVERY_DAY'] = ((int)($params['EVERY_DAY'] ?? null) ?: 1);
	$params['EVERY_WEEK'] = ((int)($params['EVERY_WEEK'] ?? null) ?: 1);
	$params['MONTHLY_DAY_NUM'] = ((int)($params['MONTHLY_DAY_NUM'] ?? null) ?: 1);
	$params['MONTHLY_MONTH_NUM_1'] = ((int)($params['MONTHLY_MONTH_NUM_1'] ?? null) ?: 1);
	$params['MONTHLY_MONTH_NUM_2'] = ((int)($params['MONTHLY_MONTH_NUM_2'] ?? null) ?: 1);
	$params['YEARLY_DAY_NUM'] = ((int)($params['YEARLY_DAY_NUM'] ?? null) ?: 1);

	$params['PERIOD'] = (string)($params['PERIOD'] ?? null);
	$params['WEEK_DAYS'] = ($params['WEEK_DAYS'] ?? null);
	$params['TIME'] = ($params['TIME'] ?? '');
	$params['WORKDAY_ONLY'] = (($params['WORKDAY_ONLY'] ?? null) === 'Y' ? 'Y' : 'N');
	$params['END_DATE'] = ($params['END_DATE'] ?? null);

	$params['MONTHLY_TYPE'] = static::parseTypeSelector($params['MONTHLY_TYPE'] ?? null);
	$params['YEARLY_TYPE'] = static::parseTypeSelector($params['YEARLY_TYPE'] ?? null);

        if ($params['PERIOD'] === '')
        {
            $params['PERIOD'] = 'daily';
        }
        if (!is_array($params['WEEK_DAYS']))
        {
            $params['WEEK_DAYS'] = [];
        }

	$time = 3600 * 5; // five hours
	if (trim($params['TIME']) !== '')
	{
		$time = BitrixTasksUI::parseTimeAmount($params['TIME'], 'HH:MI');
	}
	$params['TIME'] = BitrixTasksUI::formatTimeAmount($time, 'HH:MI');

	if (array_key_exists('TIMEZONE_OFFSET', $params))
	{
		$params['TIMEZONE_OFFSET'] = (int)$params['TIMEZONE_OFFSET'];
	}

	// for old templates
	if (!array_key_exists('REPEAT_TILL', $params) && (string)$params['END_DATE'] !== '')
	{
		$params['REPEAT_TILL'] = 'date';
	}

	return $params;
}