data retreiving problem

<?php
//  $viewusername ="";
// $viewcontactnumber = "";
// $viewaddress = "";
// $viewcountry = "";
// $viewcity = "";
// $viewzipcode = "";

    if ($_SERVER['REQUEST_METHOD'] == "POST") {
        if (isset($_POST['mydata'])) {
            $host = 'localhost';
            $user = 'root';
            $pass ='';
            $db = 'valocy';

            $con = mysqli_connect($host,$user,$pass,$db) or die(mysqli_error());
            $sql = "select * from addressdetails WHERE email='haroondar0037@gmail.com'";
            if($result = mysqli_query($con, $sql)){
           while ( $resultarr = mysqli_fetch_array($result)) {

                $viewusername = $resultarr['fullname'];
                 // $viewusername = htmlspecialchars($resultarr['fullname'],ENT_QUOTES);
                // $viewcontactnumber = $resultarr['contactnumber'];
                // $viewaddress = $resultarr['address'];
                // $viewcountry = $resultarr['country'];
                // $viewcity = $resultarr['city'];
                // $viewzipcode = $resultarr['zipcode'];
            }
        }
        else{echo "jngjsngfjsnjns  skdjnfjskdnfjk sdknfjnsd";}
        }
    }
?>
<?php include('includes/header.php'); ?>

<br><br><br><br><br>
<div class="col-sm-offset-3 col-sm-2 col-xs-offset-3" style="margin-top:5px;">
    <form method="POST" action="">
        <button type="submit" name="mydata" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal">View My Data</button>
     </form>
</div>

<!-- 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">Your Data</h4>
      </div>
      <div class="modal-body">
        <?php
        echo "name: $viewusername"; ?>
      </div>
      <div class="modal-footer">
        <input type="button" name="close" value="close" class="btn btn-default" data-dismiss="modal">
      </div>
    </div>

  </div>
</div>