this solution requires you to the simple_html_dom. you can get it here
<?php
require_once 'simple_html_dom.php';
$html = '
<table class="articles">
<tbody>
<tr>some text here maybe tags</tr>
<tr>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td><a href="link.html">WANT TO GET THIS TEXT</a></td>
</tr>
</tbody>
</table>
<table class="articles">
<tbody>
<tr>some text here maybe tags</tr>
<tr>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td><a href="link.html">WANT TO GET THIS TEXT</a></td>
</tr>
</tbody>
</table>
<table class="articles">
<tbody>
<tr>some text here maybe tags</tr>
<tr>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td> some text here maybe tags </td>
<td><a href="link.html">WANT TO GET THIS TEXT</a></td>
</tr>
</tbody>
</table>
';
$html = str_get_html($html);
foreach($html->find('table[class=articles]') as $element){
$result = $element->find('tr');
$result = $result[1]->find('td');
echo($result[4]); echo('<br>');
}
?>