php get dom html elements - php

Question

I have some PHP code which returns the HTML content from another file:
$html = file_get_contents('myFile.html');
$dom = new DOMDocument();
$dom->loadHTML($html);
This is a part of the content of $html:
<table class="content_table">
<tbody>
<tr>
<td>Value1</td>
<td>Value2</td>
<td>Value3</td>
</tr>
<tr>
<td>Value1</td>
<td>Value2</td>
<td>Value3</td>
</tr>
</tbody>
</table>
My question:
How can I get all the values of <td> where the table tag has the class "content_table"?

Answer 1

The following query looks for table element that has content_table class, then extracts the td values from it:
<?php
$html = '<table class="content_table">
<tbody>
<tr>
<td>Value1</td>
<td>Value2</td>
<td>Value3</td>
</tr>
<tr>
<td>Value1</td>
<td>Value2</td>
<td>Value3</td>
</tr>
</tbody>
</table>';
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);
$data = [];
foreach($xpath->query('//table[#class="content_table"]') as $table) {
foreach($table->getElementsByTagName('td') as $td) {
$data[] = $td->nodeValue;
}
}
print_r($data);
Or if you need only td elements that have content_table class then it do the task:
foreach($xpath->query('//td[#class="content_table"]') as $td) {
$data[] = $td->nodeValue;
}
Example html:
$html = '<table class="content_table">
<tbody>
<tr>
<td>Value1</td>
<td class="content_table">Value2</td>
<td>Value3</td>
</tr>
<tr>
<td>Value1</td>
<td class="content_table">Value2</td>
<td>Value3</td>
</tr>
</tbody>
</table>';