问如何让多个模态出现在while循环中？

EN

<?php include 'connect.php';
$sql = "SELECT * FROM products WHERE featured = 1";
$featured = mysqli_query($conn,$sql);
?>

<?php while ($product = mysqli_fetch_assoc($featured)): ?>
<div class="products">
<a  class="myBtn"><img src="<?= $product['image'];?>" height="300" 
width="275"></a>
<a href="#" class="myBtn"> <p><?=$product['title'];?></p></a><br>
<p>Usual Price: £<s><?= $product['list_price'];?></s></p>
<p>Sale Price: £<?= $product['price'];?></p>

</div>

<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

<!-- Modal content -->
<div class="modal-content">
<span class="close">&times;</span>
<p>Some text in the Modal..</p>
</div>

</div>
<?php endwhile ?>

/* The Modal (background) */
.modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 1; /* Sit on top */
  left: 0;
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
 }

 /* Modal Content/Box */
 .modal-content {
   background-color: #fefefe;
   margin: 15% auto; /* 15% from the top and centered */
   padding: 20px;
   border: 1px solid #888;
   width: 80%; /* Could be more or less, depending on screen size */
 }
 /* The Close Button */
.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
   }

 .close:hover,
 .close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
    }

// Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks on the button, open the modal 
btn.onclick = function() {
modal.style.display = "block";
}

// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}

// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
if (event.target == modal) {