<?php $connect_web = simplexml_load_file('http://www.tcmb.gov.tr/kurlar/today.xml');
    $usd_buying = $connect_web->Currency[0]->BanknoteBuying;
    $usd_selling = $connect_web->Currency[0]->BanknoteSelling;
    $connect_web = simplexml_load_file('http://www.tcmb.gov.tr/kurlar/today.xml');
        
    $usd_buying = $connect_web->Currency[0]->BanknoteBuying;
    $usd_selling = $connect_web->Currency[0]->BanknoteSelling;
     
    echo 'USD Alış: '.$usd_buying.'<br>USD Satış: '.$usd_selling; ?>