DiscountBase::migrateInstance

static function migrateInstance($oldIndex, $newIndex)
{
	$className = get_called_class();
	if (!isset(self::$instances[$className]))
		return;
	if (isset(self::$instances[$className][$oldIndex]) && !isset(self::$instances[$className][$newIndex]))
	{
		self::$instances[$className][$newIndex] = self::$instances[$className][$oldIndex];
		unset(self::$instances[$className][$oldIndex]);
	}
}