Converter.php

<?php
 
namespace Money;
 
final class Converter
{
    private $currencies;
 
    private $exchange;
 
    public function __construct(Currencies $currencies, Exchange $exchange)
    {
        $this->currencies = $currencies;
        $this->exchange = $exchange;
    }
 
    public function convert(Money $money, Currency $counterCurrency, $roundingMode = Money::ROUND_HALF_UP)
    {
        $baseCurrency = $money->getCurrency();
        $ratio = $this->exchange->quote($baseCurrency, $counterCurrency)->getConversionRatio();
 
        $baseCurrencySubunit = $this->currencies->subunitFor($baseCurrency);
        $counterCurrencySubunit = $this->currencies->subunitFor($counterCurrency);
        $subunitDifference = $baseCurrencySubunit - $counterCurrencySubunit;
 
        $ratio = (string) Number::fromFloat($ratio)->base10($subunitDifference);
 
        $counterValue = $money->multiply($ratio, $roundingMode);
 
        return new Money($counterValue->getAmount(), $counterCurrency);
    }
}