<?php
use Laminas\Dom\Document\Query;
use Laminas\Dom\Document;
$file = __DIR__ . '/templates/site.html';
$doc = new Document(file_get_contents($file));
/* @var $nodes \Laminas\Dom\Document\NodeList */
$nodeList = Query::execute('h1', $doc, Query::TYPE_CSS);
// NodeList implements Iterator, Countable, ArrayAccess
echo $nodeList[0]->nodeValue;