摘要：需要注意的是，凡是涉及到兩個幣種之間轉換的，都必須確保系統中已經導入了兩幣種之間的匯率。更多幣種之間的方法可以到助手類中找到。將人民幣轉換為美金將美金轉換為人民幣匯率的導入后臺頁面有個按鈕點擊導入貨幣匯率。

1、獲取當前店鋪的貨幣方法：
  當前店鋪的基準貨幣：$baseCurrencyCode = Mage::app()->getStore()->getBaseCurrencyCode();
 $CurrentCurrencyCode = Mage::app()->getStore()->getCurrentCurrencyCode();
 $CurrentCurrencySymnol = Mage::app()->getLocale()->currency(Mage::app()->getStore()->getCurrentCurrencyCode())->getSymbol();
 $CurrentCurrencyName = Mage::app()->getLocale()->currency(Mage::app()->getStore()->getCurrentCurrencyCode())->getName();
2、獲取自定義貨幣的符號，code,返回的是一個二維數組
  $currencyDate = Mage::getModel("currencysymbol/system_currencysymbol")->getCurrencySymbolsData()；
//獲取系統默認的結算幣種
$baseCurrencyCode = Mage::app()->getBaseCurrencyCode();

//獲取所有系統可用結算幣種
$allowedCurrencies = Mage::getModel("directory/currency")
    ->getConfigAllowCurrencies();

//獲取兩個幣種之間的匯率
$currencyRates = Mage::getModel("directory/currency")
    ->getCurrencyRates($baseCurrencyCode, array_values($allowedCurrencies));

下面是幾個常用的貨幣轉換方法。需要注意的是，凡是涉及到兩個幣種之間轉換的，都必須確保系統中已經導入了兩幣種之間的匯率。更多幣種之間的方法可以到directory/data助手類中找到。

// 將100人民幣轉換為美金
$Price = Mage::helper("directory")->currencyConvert(100, "CNY", "USD");
//將100美金轉換為人民幣
$Price = Mage::helper("directory")->currencyConvert(100, "USD", "CNY");

匯率的導入：
magento后臺currency rate頁面有個Import按鈕：

點擊import導入貨幣匯率。
匯率導入的方法：

class Mage_Adminhtml_System_CurrencyController extends Mage_Adminhtml_Controller_Action
{
    public function fetchRatesAction()
    {
        try {
            $service = $this->getRequest()->getParam("rate_services");/*后臺Import Service 的值*/
            $this->_getSession()->setCurrencyRateService($service);
            if( !$service ) {
                throw new Exception(Mage::helper("adminhtml")->__("Invalid Import Service Specified"));
            }
            try {/*實例化Webservicex這個Model，magento自帶的是Webservicex*/
                $importModel = Mage::getModel(
                    Mage::getConfig()->getNode("global/currency/import/services/" . $service . "/model")->asArray()
                );
            } catch (Exception $e) {
                Mage::throwException(Mage::helper("adminhtml")->__("Unable to initialize import model"));
            }
            $rates = $importModel->fetchRates();
            $errors = $importModel->getMessages();
            if( sizeof($errors) > 0 ) {
                foreach ($errors as $error) {
                    Mage::getSingleton("adminhtml/session")->addWarning($error);
                }
                Mage::getSingleton("adminhtml/session")->addWarning(Mage::helper("adminhtml")->__("All possible rates were fetched, please click on "Save" to apply"));
            } else {
                Mage::getSingleton("adminhtml/session")->addSuccess(Mage::helper("adminhtml")->__("All rates were fetched, please click on "Save" to apply"));
            }

            Mage::getSingleton("adminhtml/session")->setRates($rates);
        }
        catch (Exception $e){
            Mage::getSingleton("adminhtml/session")->addError($e->getMessage());
        }
        $this->_redirect("*/*/");
    }
}

下面是Webservicx的文件路徑：

說明:
$rates = $importModel->fetchRates();這不調用的方法在下面可以找到：

abstract class Mage_Directory_Model_Currency_Import_Abstract
{
/*Webservicex繼承這個Model*/
 public function fetchRates()
    {
        $data = array();
        $currencies = $this->_getCurrencyCodes();/*獲取website所有允許的貨幣code*/
        $defaultCurrencies = $this->_getDefaultCurrencyCodes();/*獲取website中默認貨幣code*/
        @set_time_limit(0);/*設置程序執行時間，為零表示，執行直到程序結束（因為要去第三方獲取資源，所以較長）*/
        foreach ($defaultCurrencies as $currencyFrom) {
            if (!isset($data[$currencyFrom])) {
                $data[$currencyFrom] = array();
            }

            foreach ($currencies as $currencyTo) {
                if ($currencyFrom == $currencyTo) {
                    $data[$currencyFrom][$currencyTo] = $this->_numberFormat(1);
                }
                else {
                    $data[$currencyFrom][$currencyTo] = $this->_numberFormat($this->_convert($currencyFrom, $currencyTo));
                }
            }
            ksort($data[$currencyFrom]);
        }

        return $data;
    }
}

根據以上幾個方法，可以寫一個定時任務，按時更新store的貨幣匯率