[Solved] How to get serial numbers dynamically? [closed]

remember to increase the number for each row.

<?php
    $serial_no = 1;
    foreach ($seats as $seat) {
?>
   <tr>
      <td>
         <?php echo $serial_no++; ?>
      </td>
      <td>
         other markup here
      </td>
<tr>
<?php   } ?>