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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)); } } abstract class MoneyFormatterExtension { protected $formatter; public function __construct(MoneyFormatter $formatter) { $this->formatter = $formatter; } public function getFilters() { return array( new \Twig_SimpleFilter($this->getFilterName(), array($this->formatter, 'format')), ); } public function getName() { return sprintf('%s_money_formatter_extension', $this->getFilterName()); } abstract protected function getFilterName(); } class WeirdFormatterExtension extends MoneyFormatterExtension { public function __construct(WeirdMoneyFormatter $formatter) { parent::__construct($formatter); } protected function getFilterName() { return 'weird'; } } class GDPFormatterExtension extends MoneyFormatterExtension { public function __construct(GDPMoneyFormatter $formatter) { parent::__construct($formatter); } protected function getFilterName() { return 'gdp'; } }

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