如何使用javascript或php根据其他单元格的值添加特定于值的列？

Question

Let's say for example column dropdown represents a type of membership and depending on the value of dropdown, I would like to be able to display a column next to it that indicates the maximum number of companions I could bring. Is there a way to do it via javascript or PHP or maybe SQL itself?

<?php
        foreach ($dbh->query($sql) as $rows){
        ?>
        <tr>
            <td><?php echo $rows['name']?></td>
            <td><?php echo $rows['email']?></td>
            <td><?php echo $rows['number']?></td>
            <td><?php echo $rows['org']?></td>     
            <td><?php echo $rows['dropdown']?></td>
            <td><?php echo $rows['date']?></td>
        </tr>
     <?php
      }
     ?>

Answer 1

Code:

<?php
    foreach ($dbh->query($sql) as $rows){
    ?>
    <tr>
        <td id="<?=$rows['id']?>"><?php echo $rows['name']?></td>
    </tr>
 <?php
  }
 ?>

By clicking on the ajax button you will take the ID attribute of the column, send a request with the received id and add the value to the column created next to it.

If I understand you correctly.