$servername = "localhost";
$username = "phpproject";
$password = "pass";
$dbname = "ProjectDb";

// Create connection
    $conn = new mysqli($servername, $username, $password, $dbname);
    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

define('DB_SERVER', 'localhost');
   define('DB_USERNAME', 'phpproject');
   define('DB_PASSWORD', 'pass');
   define('DB_DATABASE', 'ProjectDb');
   $db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);