Method getAllCurrencies

public static function getAllCurrencies()
{
    if (self::$allcurrencies === false) {
        $db = Factory::getDBO();
        $query = ' SELECT a.id, a.id as value, CONCAT_WS(\'\', a.title, \' (\', a.code, \')\') as text, a.title, a.alias, a.code, a.image FROM #__phocacart_currencies AS a' . ' WHERE a.published = 1' . ' ORDER BY a.id';
        $db->setQuery($query);
        $c = $db->loadObjectList();
        if (!empty($c)) {
            self::$allcurrencies = $c;
        } else {
            self::$allcurrencies = false;
        }
    }
    return self::$allcurrencies;
}