$connect_web = simplexml_load_string(file_get_contents('http://www.tcmb.gov.tr/kurlar/today.xml'));
$usd_buying = $connect_web->Currency[0]->BanknoteBuying;
$usd_selling = $connect_web->Currency[0]->BanknoteSelling;
$euro_buying = $connect_web->Currency[3]->BanknoteBuying;
$euro_selling = $connect_web->Currency[3]->BanknoteSelling;
$connect_web = simplexml_load_string(file_get_contents('http://www.tcmb.gov.tr/kurlar/today.xml'));

$usd_buying = $connect_web->Currency[0]->BanknoteBuying;
$usd_selling = $connect_web->Currency[0]->BanknoteSelling;

$euro_buying = $connect_web->Currency[3]->BanknoteBuying;
$euro_selling = $connect_web->Currency[3]->BanknoteSelling;

echo 'USD Alış: '.$usd_buying.'
USD Satış: '.$usd_selling.'
';
echo 'EUR Alış: '.$euro_buying.'
EUR Satış: '.$euro_selling;
?>

olarak değiştirin.