Dynamic generated nested table

I'm stuck on this issue for a while now, and i can't figure out how to solve this. I have a feeling i'm rather close to solving this. But the final piece of the puzzle is missing.

What i'm trying to do? I use the MPDF library to render an PDF based on a XML source file. I want to make use of the nested table functionality. And creating the table with static html and rendering it works like a charm. However, generating the same structure based on the data itself is giving me a headache. The DOM structure should be: https://pastebin.com/zuQAykCB.

With the following code:

echo '<table><tbody>';
  foreach($orderConfArray as $orderConfLine ) :
    $orderConfEconData = isset($orderConfLine['EconData']) ? $orderConfLine['EconData'] : '';
    foreach($orderConfEconData as $key => $value) :
        $x++;      

        if($x === 1 ) :

            echo '
            <tr>
            <td>blank col</td>
            <td colspan="6">
            <table cellspacing="2" class="inner" width="100%">
            <tbody>';
        endif;

        echo '<tr>';
                echo '<td>';
                echo 'content';
                echo '</td>';
        echo '</tr>';

        if($x === 16 ) :
            echo '
            </tbody>
            </table>
            </td>
            </tr>';
        $x = 0;
        $y = 0;
        endif;
    endforeach;
 endforeach;
 echo '</tbody></table>';

I get the following output https://pastebin.com/GmVDKw7e, which is close. But not yet what i'm trying to accomplish. I need to do the following (I think) to get this working:

Count the total number of items
If the count reaches a certain number (on the nested table's TD), it should create a new TR within the nested table and continue from there.
If we reach a certain number of TR's within the nested table. It should create a new TR with a nested table altogether.
I can't wrap my head around this. Does anyone have a clue on how to fix this?

Comments

[Nick Knoops]

Ah.. Thanks dude! Will look into your solution. I was trying something along the lines of adding extra counters on the parts where i open/close rows and tables. But this will do aswell