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<?php class Amount { var $amount; } class TaxedAmount extends Amount { var $rate; function __toString() { return $this->amount * $this->rate; } } $item = new TaxedAmount; $item->amount = 242.0; $item->rate = 1.13; echo "You owe me $" . $item->__toString(). " for this answer.";
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
You owe me $273.46 for this answer.
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87.23 ms | 1478 KiB | 4 Q