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<?php interface MoneyFormatter { public function format($value, $decimals = 0, $decimalPoint = '.', $thousandsSeparator = ','); } class GDPMoneyFormatter implements MoneyFormatter { public function format($value, $decimals = 0, $decimalPoint = '.', $thousandsSeparator = ',') { return sprintf('$%s', number_format($number, $decimals, $decPoint, $thousandsSep)); } } class WeirdMoneyFormatter implements MoneyFormatter { public function format($value, $decimals = 0, $decimalPoint = '.', $thousandsSeparator = ',') { return sprintf('$%s', number_format($number, $decimals, $decPoint, $thousandsSep)); } } interface MoneyFormatterExtensionInterface { public function __construct(MoneyFormatter $formatter); } abstract class MoneyFormatterExtension implements MoneyFormatterExtensionInterface { protected $formatter; public function __construct(MoneyFormatter $formatter) { $this->formatter = $formatter; } } class WeirdFormatterExtension extends MoneyFormatterExtension { public function __construct(WeirdMoneyFormatter $formatter) { parent::__construct($formatter); } } class GDPFormatterExtension extends MoneyFormatterExtension { public function __construct(GDPMoneyFormatter $formatter) { parent::__construct($formatter); } }