<?php
    
    $currency='USD';
    $client = new SoapClient("http://www.mnb.hu/arfolyamok.asmx?wsdl");
    $response = $client->__soapCall("GetCurrentExchangeRates", array());
    $doc = new DOMDocument;
    $doc->loadXML($response->GetCurrentExchangeRatesResult);
    $xpath = new DOMXPath($doc);
    $query = "//MNBCurrentExchangeRates/Day/Rate[@curr='$currency']";
    $entries = $xpath->query($query);
    if($entries->length){
        var_dump($entries->item(0)->nodeValue);
    } else {
        echo "Error";  
    }
    
?>