1. Go to this page and download the library: Download rubin/openexchangerates library. Choose the download type require.
2. Extract the ZIP file and open the index.php.
3. Add this code to the index.php.
<?php
require_once('vendor/autoload.php');
/* Start to develop here. Best regards https://php-download.com/ */
rubin / openexchangerates example snippets
$api = new OpenExchangeRates\OpenExchangeRatesApi('{APP_ID}');