Trouble scraping table with DOMXPath - php

Question

I have a table I'm trying to scrape that looks like this:
<table id="thisTable">
<tr>
<td class="value1"></td>
<td class="value2"></td>
<td class="value3"></td>
<td class="value4"></td>
</tr>
<tr>
<td class="value5"></td>
<td class="value6"></td>
</tr>
</table>
and my DOMXPath that looks like this (so far):
$htmlDoc = new DomDocument();
#$htmlDoc->loadhtml($html);
$xpath = new DOMXPath($htmlDoc);
$nodelist = $xpath->query('//*[#id="thisTable"]');
foreach ($nodelist as $n){
echo $n->nodeValue."\n";
}
This works, I get the values of the table, but how do I specify the class of a nodeValue? Ultimately, my goal is to build a new table from the td's content of value2, value4 and value5 in a single row.

Answer 1

$htmlDoc = new DomDocument();
$htmlDoc->loadHTML($html);
$xpath = new DOMXPath($htmlDoc);
$nodelist = $xpath->query('//td');
foreach ($nodelist as $n){
echo $n->getAttribute("class")."\n";
}
Note: Use getAttribute property for getting values of class

Answer 2

Expand your xpath-query:
$class="value1";
$nodelist = $xpath->query('//*[#id="thisTable"][#class="$class"]');

Answer 3

Not sure if I understand correctly, if you want the text contents of value2, value4 and value5 in a single row, you can use this xpath:
(//td[#class='value2'] | //td[#class='value4'] | //td[#class='value5'])/text()
For example:
<table id="thisTable">
<tr>
<td class="value1"> 1111</td>
<td class="value2"> 222 </td>
<td class="value3">333 </td>
<td class="value4"> 444</td>
</tr>
<tr>
<td class="value5"> 555</td>
<td class="value6"> 666</td>
</tr>
</table>
output will then be: 222 444 555