function currencyCode($collection = false)
{
if (is_string($collection) and $collection != '') {
$currencyCode = $collection;
} else {
if ($collection instanceof eZProductCollection === false) {
$collection = eZProductCollection::fetch($this->attribute('productcollection_id'));
}
$currencyCode = $collection->attribute('currency_code');
}
// Backwards compability for orders done with the price datatype.
if ($currencyCode == '') {
$currencyCode = eZOrder::fetchLocaleCurrencyCode();
}
return $currencyCode;
}
