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<?php
  $conn = mysqli_connect('localhost', 'root', '', 'classTest');

  if(isset($_POST['submit'])){
    echo "Form was submitted" . '<br>';

    $username = $_POST['username'];
    $password = $_POST['password'];

    $username = mysqli_real_escape_string($conn, $username);
    $password = mysqli_real_escape_string($conn, $password);

    echo "Username: " . $username . '<br>';
    echo "Password: " . $password . '<br>';
  }
?>

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Test</title>
  </head>
  <body>

    <form action="test.php" method="post">
      <input type="text" name="username">
      <input type="password" name="password">
      <input type="submit" name="submit" value="submit">
    </form>
  </body>
</html>