DiscountBase::getInstance

static function getInstance($index)
{
	$className = get_called_class();
	if (!isset(self::$instances[$className]))
		self::$instances[$className] = array();
	if (!isset(self::$instances[$className][$index]))
		self::$instances[$className][$index] = self::createObject();

	return self::$instances[$className][$index];
}