To find the number of nodes in a DomNodeList you need to access the length
property... sample code to do this:
<?php
$xml = <<<XML
<music>
<artist id="1">
<name>The Rolling Stones</name>
<albums>
<title>Exile On Main Street</title>
</albums>
</artist>
<artist id="2">
<name>Aimee Mann</name>
<albums>
<title>I'm With Stupid</title>
<title>Bachelor No. 2</title>
</albums>
</artist>
</music>
XML;
$dom = new DomDocument();
$dom->loadXML($xml);
$xpath = new DomXpath($dom);
$nodelist = $xpath->query('/music/artist');
print $nodelist->length;
?>
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