使用php DOM和xpath为特定注释提供属性的整个parentNode？

我想输出带有属性（ID或类）的注释的parentNode

如果我有这个html代码

<div><span><!--test--></span><div class="myclass"><!--test_comment--></div></div>

<div><span id="myid" style="color:blue;font-weight:bold"><!--test_comment--></span><div class="myclass"><!--test--></div></div>

如何获取div中的属性（类或ID）？nodeValue不工作

当我还是新手时，也欢迎对我的代码发表任何其他评论

<?php
$dom = new DOMDocument;
$dom->loadHTML(data());

$xpath = new DOMXPath($dom);
$node = $xpath->query('//*[comment()]');
foreach( $node as $p ) {
    echo 'output: ', $dom->saveXML($p), "\r\n";
}


function data() {
    return <<< STR
<div><span id="myid" style="color:blue;font-weight:bold"><!--test--></span><p>no comment here</p><div class="myclass"><!--test_comment--></div></div> 
STR;
}

<span id="myid" style="color:blue;font-weight:bold"><!--test_comment--></span>

<?php
$html = <<<STR
    <div><span><!--test--></span><div class="myclass"><!--test_comment--></div></div> 
STR;

$dom = new DOMDocument;
$dom->loadHTML($html);

$xpath = new DOMXPath($dom);
$node = $xpath->query('//comment()');

$myComment = $node->item(1)->textContent; // <!--test_comment-->
$myNode = $node->item(1)->parentNode->nodeName; // div

echo $node->item(1)->parentNode->nodeValue; //NOT WORKING

echo "<" . $myNode . ">" . $myComment . "</" . $myNode . ">";

?>

<div>test_comment</div>

<?php
$dom = new DOMDocument;
$dom->loadHTML(data());

$xpath = new DOMXPath($dom);
$node = $xpath->query('//*[comment()]');
foreach( $node as $p ) {
    echo 'output: ', $dom->saveXML($p), "\r\n";
}


function data() {
    return <<< STR
<div><span id="myid" style="color:blue;font-weight:bold"><!--test--></span><p>no comment here</p><div class="myclass"><!--test_comment--></div></div> 
STR;
}

output: <span id="myid" style="color:blue;font-weight:bold"><!--test--></span>
output: <div class="myclass"><!--test_comment--></div>