function __construct($c, $u)
{
if (!in_array($c, Currencies\codes())) {
throw new InvalidArgumentException("'{$c}' is not a recognized currency-code");
}
if (!is_numeric($u)) {
throw new InvalidArgumentException("Second parameter must be valid numeric value");
}
$this->currencyCode = $c;
$this->numUnits = doubleval($u);
}
function testCurrenciesRegistry()
{
assertTrue(in_array('USD', Currencies\codes()));
assertTrue(in_array('EUR', Currencies\codes()));
assertTrue(in_array('BTC', Currencies\codes()));
}