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<?php |
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namespace Z38\SwissPayment\Money; |
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/** |
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* Sum of money in mixed currencies |
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*/ |
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class MixedMoney extends Money |
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{ |
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/** |
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* @var int |
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*/ |
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protected $decimals; |
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/** |
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* Constructor |
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* |
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* @param int $cents Amount of money in cents |
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* @param int $decimals Number of minor units |
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*/ |
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public function __construct($cents, $decimals = 0) |
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{ |
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parent::__construct($cents); |
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$this->decimals = $decimals; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final public function getCurrency() |
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{ |
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return null; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final protected function getDecimals() |
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{ |
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return $this->decimals; |
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} |
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/** |
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* Returns the sum of this and an other amount of money |
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* |
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* @param Money $addend The addend |
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* |
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* @return Money The sum |
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*/ |
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public function plus(Money $addend) |
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{ |
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list($thisCents, $addendCents, $decimals) = self::normalizeDecimals($this, $addend); |
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return new static($thisCents + $addendCents, $decimals); |
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} |
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/** |
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* Returns the subtraction of this and an other amount of money |
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* |
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* @param Money $subtrahend The subtrahend |
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* |
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* @return Money The difference |
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*/ |
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public function minus(Money $subtrahend) |
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{ |
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list($thisCents, $subtrahendCents, $decimals) = self::normalizeDecimals($this, $subtrahend); |
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return new static($thisCents - $subtrahendCents, $decimals); |
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} |
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/** |
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* Normalizes two amounts such that they have the same number of decimals |
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* |
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* @param Money $a |
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* @param Money $b |
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* |
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* @return array An array containing the two amounts and number of decimals |
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*/ |
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protected static function normalizeDecimals(Money $a, Money $b) |
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{ |
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$decimalsDiff = ($a->getDecimals() - $b->getDecimals()); |
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$decimalsMax = max($a->getDecimals(), $b->getDecimals()); |
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if ($decimalsDiff > 0) { |
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return [$a->getAmount(), pow(10, $decimalsDiff) * $b->getAmount(), $decimalsMax]; |
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} elseif ($decimalsDiff < 0) { |
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return [pow(10, -$decimalsDiff) * $a->getAmount(), $b->getAmount(), $decimalsMax]; |
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} else { |
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return [$a->getAmount(), $b->getAmount(), $decimalsMax]; |
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} |
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} |
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} |
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z38 /
swiss-payment
