Group::addToQueue

private function addToQueue(int $copiedGroupId)
{
	$option = Option::get(self::MODULE_ID, self::QUEUE_OPTION, "");
	$option = ($option !== "" ? unserialize($option, ['allowed_classes' => false]) : []);
	$option = (is_array($option) ? $option : []);

	$option[] = $copiedGroupId;
	Option::set(self::MODULE_ID, self::QUEUE_OPTION, serialize($option));
}