config.php

<?php

define('DBHOST', 'myhost');
define('DBUSER', 'myuser');
define('DBPASS', 'mypassword');
define('DBNAME', 'mydatabase');

$db = new mysqli(DBHOST, DBUSER, DBPASS, DBNAME);

if ($db->connect_error) {
    die("Koneksi ke database gagal!");
}