<?php
$servername = "localhost";
$username = " jack225k";
$password = "";
$db = "jack225k_studbook_db";

$con = mysqli_connect($servername, $username,
$password, $db);

if(!con){
  die("Connection Failed: ".mysqli_connect_error());
}

?>


 <?php
  DEFINE('DB_USERNAME', 'root');
  DEFINE('DB_PASSWORD', 'root');
  DEFINE('DB_HOST', 'localhost');
  DEFINE('DB_DATABASE', 'performance_schema');

  $mysqli = new mysqli(DB_HOST, DB_USERNAME,
  DB_PASSWORD, DB_DATABASE);

 if (mysqli_connect_error()) {
    die('Connect Error ('.mysqli_connect_errno().')
  '.mysqli_connect_error());
  }

  echo 'Connected successfully.';

  $mysqli->close();
 ?>