I'm trying to use simple html dom to extract elements from a file that looks like this.
- The file has several tables that look the same class=sometable.
- Each table has a few <tr class=sometr>.
- Then inside each tr, I have ththat has the title, and a td that has a category.
What I want to extract is all titles class=title and their corresponding category number class=category for all table rows in all tables. I've loaded the file in $html. Can someone tell me what I'm supposed to find after that? I've tried even $collection = $html->find('tr'); and did a vardump on the collection but got nothing, so it looks like I'm not selecting right. 
<table class="sometable">
  <tbody>
    <tr class="sometr">
      <th><a class="title">Table 1 Title1</a></th>
      <td class="category" id="categ-113"></td>
      <td class="somename">Table 1 Title 1 name</td>
    </tr>
    <tr></tr>
    <tr></tr>                           
  </tbody>
</table>
<table class="sometable">
</table>
<table class="sometable">
</table>
 
    