Untitled

<div id="TestMe_img">
    <a href="Result.php">
    <input type="submit" value="Test Your Device">
</a>

<?php
    $server = "localhost";
    $user = "root";
    $pass = "";
    $dbname = "user_data";

    $userAgent = $_POST['userAgent'];


    // Create connection
    $conn = new mysqli($server,$user, $pass, $dbname);

   // Check connection
   if($conn -> connect_error) {
     die("Conneciton Failed: " . $conn -> connect_error);
   }

   if (empty($userAgent)) {
     echo "User Agent is blank";
     die();
   }


  $sql = "INSERT INTO UserData (UserAgent) VALUES ('$userAgent')";

  if ($conn -> query($sql) === TRUE) {
      echo "Thank you! Hana is stupid";
  }
  else
      echo "Unfortunately Hana is smart";

  $conn -> close();
  ?>

<body onload="userAgent();">
    <table>
        <tr>
            <td>user agent</td>
            <td id="userAgent"></td>
        </tr>
    </table>
</body>

function userAgent(){
    var userAgent = navigator.userAgent;
    document.getElementById('userAgent').innerHTML = userAgent;
}