pak Ivan

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">

<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>

<!-- Trigger the modal with a button -->
<button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">Open Modal</button>

<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <input type="text" name="text1" placeholder="text1">
    <input type="text" name="text2" placeholder="text2">
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal" name="run1">Close</button>
      </div>
    </div>

  </div>
</div>
<!-- https://owlcation.com/stem/DiY-PHP-and-Bootstrap-Using-Bootstrap-Modal-Box-to-Receive-Input-from-User -->
<div id="result"><?= var_dump($_POST) ?></div>

<script>
$('documen').ready(function(){
    $("button[name='run1']").click(function() {
        const vtext1 = $("input[name='text1']").val();
        const vtext2 = $("input[name='text2']").val();

        $.post("index.php", {post1:vtext1, post2:vtext2}, function(response, status) {
            $("#result").replaceWith(response);
        });

    });
});
</script>