I am working on a website and that website and want to display categories > sub-categories > sub-sub categories.

Category is showing. But i wanna display sub-category too.

Here is category code

<select>
        <option>Select Category</option>
              <?php 
              $query="select * from mydb";
              $result=mysqli_query($connect,$query);
              while($r=mysqli_fetch_assoc($result))
              {
              ?>
        <option value="<?php echo $r['id']?>"><?php echo $r['title']?></option>                                    
  <?php } ?>
  </select>

Showing Like this & Wanna Displa Like this

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OK one's a select, the other a set of checkbox es. We need to know how your data is arranged in your db.