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- /**
- * Helper class to allow 3rd party plugins to implement multi-currency
- * capabilities. The class was designed to work with the Aelia Currency Switcher,
- * for Easy Digital Downloads but it's generic enough to be adapted to other solutions.
- *
- * @author Aelia <support@aelia.co>
- * @link https://aelia.co
- * @link https://aelia.co/shop/currency-switcher-for-easy-digital-downloads/
- */
- class Currency_Helper_Class {
- // @var string Shop's base currency. Used for caching.
- protected static $_base_currency;
- /**
- * Returns shop's base currency. This method implements some simple caching,
- * to avoid calling get_option() too many times.
- *
- * @return string Shop's base currency.
- */
- protected static function shop_base_currency() {
- if(empty(self::$_base_currency)) {
- global $edd_options;
- self::$_base_currency = $edd_options['currency'];
- }
- return self::$_base_currency;
- }
- /**
- * Returns the list of the currencies enabled in the Aelia Currency Switcher.
- * If the Currency Switcher is not installed, or active, then the list will
- * only contain the shop base currency.
- *
- * @return array An array of currency codes.
- */
- public static function enabled_currencies() {
- return apply_filters('edd_aelia_cs_enabled_currencies', array(self::shop_base_currency()));
- }
- /**
- * Advanced integration with EDD Currency Switcher, developed by Aelia
- * (http://aelia.co). This method can be used by any 3rd party plugin to
- * return prices in the active currency. The method allows to specify prices
- * explicitly, thus bypassing automatic FX conversion.
- *
- * @param double price The source price.
- * @param array prices_per_currency An optional array of currency => value
- * pairs. If an entry is found in this array that matches the $to_currency
- * parameters, such value is taken as is, and the automatic conversion logic
- * is skipped.
- * @param string to_currency The target currency. If empty, the active currency
- * is taken.
- * @param string from_currency The source currency. If empty, EDD base
- * currency is taken.
- * @return double The price converted from source to destination currency.
- */
- public static function get_price_in_currency($price, array $prices_per_currency = array(), $to_currency = null, $from_currency = null) {
- if(empty($from_currency)) {
- $from_currency = self::shop_base_currency();
- }
- if(empty($to_currency)) {
- $to_currency = edd_get_currency();
- }
- // If an explicit price was passed for the target currency, just take it
- if(!empty($prices_per_currency[$to_currency])) {
- return $prices_per_currency[$to_currency];
- }
- return self::convert($price, $to_currency, $from_currency);
- }
- /**
- * Converts an amount from one currency to another, using exchange rates.
- *
- * @param float amount The amount to convert.
- * @param string to_currency The destination currency.
- * @param string from_currency The source currency.
- * @return float The amount converted to the target destination currency.
- */
- public static function convert($amount, $to_currency, $from_currency = null) {
- return apply_filters('edd_aelia_cs_convert', $amount, $from_currency, $to_currency);
- }
- public function test() {
- $price = 123;
- // Just call the get_price_in_currency() method. This will use automatic conversion
- return self::get_price_in_currency($price);
- }
- public function test2() {
- $prices_per_currency = array(
- 'USD' => 123,
- 'EUR' => 456,
- 'GBP' => 789,
- );
- // Call the get_price_in_currency() method. This will take the explicit
- // price defined in $prices_per_currency, if available. If not available,
- // automatic conversion will be used instead. The examples below assume that
- // Easy Digital Downloads base currency is USD
- // This is the price to convert, in USD
- $price = 123;
- // Example 1 - This will return "456", i.e. the price in EUR specified in the list, above
- $converted_price = self::get_price_in_currency($price, $prices_per_currency, 'EUR');
- // Example 2 - This will return "789", i.e. the price in GBP specified in the list, above
- $converted_price = self::get_price_in_currency($price, $prices_per_currency, 'GBP');
- // Example 3 - This will return "166.29" (exchange rate as of 04/08/2015), because there
- // isn't an explicity AUD price in $prices_per_currency list
- $converted_price = self::get_price_in_currency($price, $prices_per_currency, 'AUD');
- }
- }
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