PHP DOM/xpath check element span class value - php

Question

Within a curl request I have a html table that has the below structure. I now want to extract only table rows that contain a span element with the empty class and not the ones with the class="subcomponent".
I successfully tried Xpath to find the elements with the empty class but how to do I get the entire <tr> or even better specific <td> nodes that contain Version and Partnumber.
Thanks in advance.
<table>
...
<tbody>
<tr>
<td></td>
<td></td>
<td>
<span class="">Product</span>
</td>
<td>Version</td>
<td>Partnumber</td>
</tr>
<tr>
<td></td>
<td></td>
<td>
<span class="subcomponent">Component</span>
</td>
<td>Version</td>
<td>Partnumber</td>
</tr>
</tbody>
My PHP code
$doc = new DOMdocument();
libxml_use_internal_errors(true);
$doc->loadHTML($page);
$doc->saveHTML();
$xpath = new DOMXpath($doc);
$query ='//span[#class=""]';
$entries = $xpath->query($query);
foreach ($entries as $entry) {
echo $entry->C14N();
}

Answer 1

To access the table rows themselves using SimpleXML, you can use the following:
$sxml = simplexml_load_string('<table>...</table>');
$rows = $sxml->xpath('//tr[td/span[#class=""]]');
foreach ($rows as $row) {
echo "Version: ", $row->td[3], ", Partnumber: ", $row->td[4];
}
The XPath works by selecting all <tr> tags that have a child <td>, which itself has a child <span> with a blank class.
In the loop, you need to access the child cells of each row by number, since your sample doesn't indicate that they're labelled any other way. I'm assuming a table structure won't change too often though, so that should be fine.
See https://eval.in/860169 for an example.
Alternative DOMDocument Version
If you're fetching a full webpage, which won't necessarily be well-formed, you might need to use DOMDocument as you have in your first example. It's a bit less clean to access the child-elements, but something like the following will work:
$doc = new DOMdocument;
libxml_use_internal_errors(true);
$doc->loadHTML($page);
$xpath = new DOMXpath($doc);
$rows = $xpath->query('//tr[td/span[#class=""]]');
foreach ($rows as $row) {
$cells = $row->getElementsByTagName('td');
$version = $cells->item(3)->nodeValue;
$partNumber = $cells->item(4)->nodeValue;
echo "Version: {$version}, Part Number: {$partNumber}", PHP_EOL;
}
See https://eval.in/860217

Answer 2

I would use next XPath expression:
//td[text()="Version"] | //td[text()="Partnumber"]
Which gives me:
Element='<td>Version</td>'
Element='<td>Partnumber</td>'
Element='<td>Version</td>'
Element='<td>Partnumber</td>'