mongol bank currency rate crawler

require_once '/path/to/goutte.phar';

use Goutte\Client;

$client = new Client();

$crawler = $client->request('GET', 'http://mongolbank.mn/dblistofficialdailyrate.aspx');

$currency = "USD";

$rates = array();
$rates[$currency] = $crawler->filter('span#MainContent_lbl' + $currency)->text();

print_r($rates);