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<?php class Currency { public $currencyCode; public function __construct($currencyCode) { $this->currencyCode = $currencyCode; } public function equals(Currency $currency) { return $this->currencyCode === $currency->currencyCode; } } class Money { public $amount; public $currency; public function __construct($amount, Currency $currency = null) { $this->currency = $currency ?: new Currency('USD'); } } $revenue = new Money(55, new Currency('GBP')); var_dump($revenue->currency->equals(new Currency('GBP'))); $assets = new Money(55); var_dump($assets->currency->equals(new Currency('USD')));
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(true)

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