Bagaimana saya bisa menampilkan modal dari hasil aksi berikut ?

$g=$_GET['sender'];
if($g=='data_form')
{
  $sql="INSERT INTO data_form (data_1, data_2, data_3, data_4, data_5, data_6, data_7, data_8, data_9, data_10, data_11, data_12)
  VALUES
  ('$_POST[data_1]',
  '$_POST[data_2]',
  '$_POST[data_3]',
  '$_POST[data_4]',
  '$_POST[data_5]',
  '$_POST[data_6]',
  '$_POST[data_7]',
  '$_POST[data_8]',
  '$_POST[data_9]',
  '$_POST[data_10]',
  '$_POST[data_11]',
  '$_POST[data_12]')";
  if (mysqli_query($config, $sql)) {
    $last_id = mysqli_insert_id($config);
    echo '<script>
    Swal.fire({
      title: "Terimakasih ('.$_POST[data_1].') !",
      text: "Data anda berhasil disimpan!",
      icon: "success",
      buttonsStyling: false,
      confirmButtonText: "Confirm me!",
      customClass: {
       confirmButton: "btn btn-primary"
     }
     }).then((value) => {
      window.location.href = "index.php"; 
      })
      </script>';
    }
    else
     {
      echo "Error: " . $sql . "<br>" . mysqli_error($config);
    }

<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalSizeLg" aria-hidden="true">
   <div class="modal-dialog modal-dialog-centered" role="document">
      <div class="modal-content">
         <div class="modal-header">
          <h5 class="modal-title" id="add"></h5>
          <button type="button" class="close" data-dismiss="modal" aria-label="Close"><i aria-hidden="true" class="ki ki-close"></i>
          </button>
          </div>
          <div class="modal-body">
             <table class="table table-borderless">
                         <?php    
                         $no = 1;
                         $data = mysqli_query($config,"SELECT * FROM data_form WHERE id IN (SELECT MAX(id) FROM data_form)");
                         while($row = mysqli_fetch_array($data)){
                         ?>
                         <tr>
                          <th> Data 1:</th>
                          <td> <?php echo $row['data_1'];?> </td>
                        </tr>
                        <tr>
                          <th> Data 2:</th>    
                         <td> <?php echo $row['data_2'];?> </td>    
                      </tr>
                     <?php 
                    }
                   ?>
             </table>
         </div>
      </div>
   </div>
</div>