function canAddProduct($contentObject)
{
$error = eZError::SHOP_OK;
$productType = eZShopFunctions::productTypeByObject($contentObject);
if ($productType === false) {
$error = eZError::SHOP_NOT_A_PRODUCT;
} else {
if (!eZShopFunctions::isSimplePriceProductType($productType)) {
$error = eZShopFunctions::isPreferredCurrencyValid();
}
if ($error === eZError::SHOP_OK) {
$basketType = $this->type();
if ($basketType !== false && $basketType !== $productType) {
$error = eZError::SHOP_BASKET_INCOMPATIBLE_PRODUCT_TYPE;
}
}
}
return $error;
}
static function setPreferredCurrencyCode($currencyCode)
{
$error = eZShopFunctions::isPreferredCurrencyValid($currencyCode);
if ($error === eZError::SHOP_OK) {
eZPreferences::setValue('user_preferred_currency', $currencyCode);
}
return $error;
}