The best way to install Exchange Rate is using Composer:

$ composer require galek/exchange-rate

Packagist - Versions

or manual edit composer.json in your project

"require": {
    "galek/exchange-rate": "^0.2.8"
}

You can use exchange rate of ČNB

$cnb = new \TroiaStudio\ExchangeRate\CNB\Day;

$cnb = new \TroiaStudio\ExchangeRate\CNB\Day;

• Universal calculatator for transfer between exchanges
• Add Raiffeisenbank
• Add Česká spořitelna
• Add ČSOB
• Add MoneyBank
• Add ... (write to issue if you want add some else)