Magento: How to change Currency symbol by Model Override ?

In my previous article, I have written about how you can change the currency symbol by making some change in the Zend (lib/Zend/Locale/Data/en.xml) file.

It's easy way but the main drawback of this method is that all your changes will vanish once you upgrade Magento.

A better way will be overriding Magento model classes that are responsible for fetching the currency symbol.

In this article, I will be showing you how to override Magento model classes to change the currency symbol.

Scenario

I need to change the currency symbol of Nepalese Rupee (from Nrs to Rs). By default, the currency symbol for Nepalese Rupee is Nrs.

Solution

Create a new module and Override two model classes.

1) Mage_Core_Model_Locale_Currency
2) Mage_Core_Model_Locale

Config file of my module
(MyNamespace/MyModule/etc/config.xml)

<global>     <models>         <core>             <rewrite>                 <locale_currency>MyNamespace_MyModule_Model_Locale_Currency</locale_currency>                 <locale>MyNamespace_MyModule_Model_Locale</locale>             </rewrite>         </core>     </models> </global>

MyNamespace_MyModule_Model_Locale_Currency class of my module
(MyNamespace/MyModule/Model/Locale/Currency.php)

In this class I have changed currency symbol from Nrs to Rs.

class MyNamespace_MyModule_Model_Locale_Currency extends Mage_Core_Model_Locale_Currency {     /**      * Creates a currency instance. Every supressed parameter is used from the actual or the given locale.      *      * @param  string             $currency OPTIONAL currency short name      * @param  string|Zend_Locale $locale   OPTIONAL locale name      * @throws Zend_Currency_Exception When currency is invalid      */     public function __construct($currency = null, $locale = null)     {         if (Zend_Locale::isLocale($currency, true, false)) {             $temp     = $locale;             $locale   = $currency;             $currency = $temp;         }         $this->setLocale($locale);         // Get currency details         $this->_options['currency'] = Zend_Currency::getShortName($currency, $this->_locale);         $this->_options['name']     = Zend_Currency::getName($currency, $this->_locale);         //$this->_options['symbol']   = Zend_Currency::getSymbol($currency, $this->_locale);         /************************************************          * Here's the logic to change the currency symbol          ************************************************          */         if(Zend_Currency::getSymbol($currency, $this->_locale) == 'Nrs') {             $this->_options['symbol'] = 'Rs';         }         else {             $this->_options['symbol']   = Zend_Currency::getSymbol($currency, $this->_locale);         }         if (($this->_options['currency'] === null) and ($this->_options['name'] === null)) {             #require_once 'Zend/Currency/Exception.php';             throw new Zend_Currency_Exception("Currency '$currency' not found");         }         // Get the format         $this->_options['position'] = $this->_updateFormat();         $this->_options['display']  = Zend_Currency::NO_SYMBOL;         if (empty($this->_options['symbol']) === false) {             $this->_options['display'] = Zend_Currency::USE_SYMBOL;         } else if (empty($this->_options['currency']) === false) {             $this->_options['display'] = Zend_Currency::USE_SHORTNAME;         }         //parent::__construct($currency, $locale);         $this->_options['symbol_choice'] = self::getSymbolChoice($currency, $this->_locale);     } }

MyNamespace_MyModule_Model_Locale class of my module
(MyNamespace/MyModule/Model/Locale.php)

class MyNamespace_MyModule_Model_Locale extends Mage_Core_Model_Locale {     /**     * Create Mage_Core_Model_Locale_Currency object for current locale     *     * @param   string $currency     * @return  Mage_Core_Model_Locale_Currency     */     public function currency($currency)     {         Varien_Profiler::start('locale/currency');         if (!isset(self::$_currencyCache[$this->getLocaleCode()][$currency])) {             try {                 $currencyObject = new MyNamespace_MyModule_Model_Locale_Currency($currency, $this->getLocale());             } catch (Exception $e) {                 $currencyObject = new MyNamespace_MyModule_Model_Locale_Currency($this->getCurrency(), $this->getLocale());                 $options = array(                         'name'      => $currency,                         'currency'  => $currency,                         'symbol'    => $currency                 );                 $currencyObject->setFormat($options);             }             self::$_currencyCache[$this->getLocaleCode()][$currency] = $currencyObject;         }         Varien_Profiler::stop('locale/currency');         return self::$_currencyCache[$this->getLocaleCode()][$currency];     } }

In this way, you can override Magento Model classes to change the currency symbol.