- var_dump: documentation ( source)
<?php
const XML = <<<XML
<rates base="GBP" ts="1573679946">
<rate code="AED" rate="4.7190899844812" live="0"/>
<rate code="AFN" rate="100.47049152188" live="0"/>
</rates>
XML;
$doc = new DOMDocument();
$doc->loadXML(XML);
$xpath = new DOMXPath($doc);
$code = 'AED';
$result = $xpath->query("//rate[@code='{$code}']");
var_dump($result->item(0)->getAttribute('rate'));