I'm trying to parse a string containing an HTML table using the
builtin DOM classes and running into an odd problem.

Here's what I'm doing:
$dom = new DOMDocument();
$tables = $dom->getElementsByTagName("table");
$rows = $tables->item(0)->getElementsByTagName('tr');
foreach($rows as $row){
    foreach($row->childNodes as $node)
         // stuff

This gives me the row elements in order and access to their contents.
The weird part is $node always appears to be a td tag - even when it's
a th tag in the original string (DOMElement::tagName is always "td"
(as well as DOMNode::nodeName and DOMNode::localName)). The th tags
definitely aren't being omitted; I still get nodes with their
contents, just with the wrong tag name.

Is there any way to override this behavior so that I can distinguish
between td tags and th tags?

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