<?php class Money { private $amount; public function __construct($amount) { $this->amount = $amount; } public function equals(Money $otherMoney) { return $this->amount === $otherMoney->amount; } } class MonopolyMoney extends Money { } $a = new Money(1); $b = new MonopolyMoney(1); var_dump($a->equals($b)); var_dump($a->amount == 1);
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