Kursna lista i konvertor valuta PHP

Code:
<?php

    define('CURRENCY_CAD', 'english-can');
    define('CURRENCY_EUR', 'german');
    define('CURRENCY_SRB', 'serbain');
    define('CURRENCY_USD', 'american-english');
    
    function get_currency($iPrice, $szLocale)
    {
        $aExchangeRates = array    (    
                                    'CAD' => 0.919996,
                                    'EUR' => 0.681642,
                                    'SRB' => 0.475255,
                                    'USD' => 2.10260
                                );
                            
        setlocale(LC_MONETARY, $szLocale);
        $aLocale = localeconv();
        
        $iExchangeRate = $aExchangeRates[trim($aLocale['int_curr_symbol'])];
        $iTotal = $iPrice * $iExchangeRate;
        
        return $aLocale['currency_symbol'] . number_format($iTotal, 2);
    }
    
    echo get_currency(50, CURRENCY_SRB);

?>