Php/HTML subtotal row in table

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HTML

PHP

CodeIgniter

Hello,

I am working in a project using Codeigniter / mysql and I want a table showing Fee details for multiple sessions, what I want is to show session for each group once and also to show a subtotal of that session at the end, I successfully did to show/display the session as group row in table but not able to display the subtotal row.

Image of the table is attached:

Students-Fee-Detail

Please help.

What I have tried:

<table class="table table-striped table-bordered table-sm">
                <thead>
                <tr>
                    <th>FeeType</th>
                    <th>FeePayable</th>
                    <th>PaidAmount</th>
                    <th>Balance</th>
                    <th>PaidDate</th>
                    <th>Paid</th>
                </tr>
                </thead>
                <tbody>
                <?php $feedails = getFeeDetail($row['studentid']);
                $sessionid = null;
                foreach($feedails as $obj){
                    if($obj['sessionid'] != $sessionid || $sessionid == null){
                         ?>
                    <tr class="bg-dark text-white">
                        <td colspan="6"><?=$obj['session']; ?></td>
                    </tr>
                    <tr>
                    <td><?=$obj['feetype'];?></td>
                    <td><?=$obj['feepayable'];?></td>
                    <td><?=$obj['paidamount'];?></td>
                    <td><?=$obj['balance'];?></td>
                    <td><?=$obj['paiddate'];?></td>
                    <td><?php if($obj['paid'] == 1 || $obj['paid'] == 2) { ?> Fee Paid <?php }
                    else { ?> Not Paid <?php } ?></td>
                </tr>
                    <?php $sessionid = $obj['sessionid'];
                 } else { ?>
                <tr>
                <td><?=$obj['feetype'];?></td>
                <td><?=$obj['feepayable'];?></td>
                <td><?=$obj['paidamount'];?></td>
                <td><?=$obj['balance'];?></td>
                <td><?=$obj['paiddate'];?></td>
                <td><?php if($obj['paid'] == 1 || $obj['paid'] == 2) { ?> Fee Paid <?php }
                    else { ?> Not Paid <?php } ?></td>
                </tr>
              <?php 
                    }
                }
                ?>
                </tbody>
            </table>