Untitled

<!DOCTYPE html>
<html lang="de" dir="ltr">
  <head>
    <meta charset="utf-8">
  <?php
      $con = mysqli_connect("", "root", "", "testdb");
      $name = $_POST[name];
      $email = $_POST[email];
      $answer1 = $_POST[gbd];
      $answer2 = $_POST[sws];
      $answer3 = $_POST[wh];
      $answer4 = $_POST[tt];
      $sql = "INSERT INTO personen(name, email, answer1, answer2, answer3, answer4)" . " VALUES('$name', '$email', '$answer1', '$answer2', '$answer3', '$answer4')";
      mysqli_query($con, $sql);

   ?>
  </head>
  <body>
  </body>
</html>