DOMDocument inladen oplossing

Hee ik probeer een rooster in te laden via DOMDocument, maar ik kom er niet uit.
Heb de afgelopen dagen tevergeefs op verschillende fora vragen gesteld.

Ik wil de roosters vergelijken op uitval maar ik weet niet precies hoe
ik de html in moet laden omdat de rijen allemaal dezelfde class names hebben en geen id.

ik ben een beetje radeloos onderhand, dus elke hulp of een duwtje in de juiste
richting word zeer gewaardeerd :)

Voorbeeld van het rooster:



Stukje code van 1 van de tabellen.

<tr class="AccentDark">
<td align="left" width="65" class="tableHeader"></td>
<td align="center" width="auto" class="tableHeader">Maandag</td>
<td align="center" width="auto" class="tableHeader">Dinsdag</td>
<td align="center" width="auto" class="tableHeader">Woensdag</td>
<td align="center" width="auto" class="tableHeader">Donderdag</td>
<td align="center" width="auto" class="tableHeader">Vrijdag</td>
</tr><tr>
<td align="left" width="50" class="tableHeader">1e uur</td>
<td align="left" width="auto" class="tableCell"><table border="0" cellpadding="0" cellspacing="0" >
<tr>
<td align="left" width="32" class="tableCell"></td>
<td align="left" width="3" class="tableCell">&nbsp</td>
<td align="left" width="75" class="tableCell"></td>
<td align="left" width="3" class="tableCell">&nbsp</td>
<td align="left" width="73" class="tableCell"></td>
<td align="left" width="9" class="tableCell"></td>
</tr>
</table>
</td>
<td align="left" width="auto" class="tableCell"><table border="0" cellpadding="0" cellspacing="0" >
<tr>
<td align="left" width="32" class="tableCell">WAS</td>
<td align="left" width="3" class="tableCell">&nbsp</td>
<td align="left" width="75" class="tableCell">HE09</td>
<td align="left" width="3" class="tableCell">&nbsp</td>
<td align="left" width="73" class="tableCell">econ</td>
<td align="left" width="9" class="tableCell">5</td>
</tr>
</table>
</td>
<td align="left" width="auto" class="tableCell"><table border="0" cellpadding="0" cellspacing="0" >
<tr>
<td align="left" width="32" class="tableCellHidden">WIK</td>
<td align="left" width="3" class="tableCellHidden">&nbsp</td>
<td align="left" width="75" class="tableCellHidden">HC17</td>
<td align="left" width="3" class="tableCellHidden">&nbsp</td>
<td align="left" width="73" class="tableCellHidden">biol</td>
<td align="left" width="9" class="tableCellHidden">4</td>
</tr>
</table>
</td>