<!DOCTYPE HTML>
<html>
    <head>
    </head>
    <body>
        <?php
            if ($_SERVER['REQUEST_METHOD'] === 'POST') {
                $user = 'test';
                $password = 'test';
                $db = new PDO('mysql:host=127.0.0.1;dbname=testdb;charset=UTF8', $user, $password);


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

                if ($username != "" && $message != "") {
                    $stmt = $db->prepare('INSERT INTO posts SET username = ?, message = ?');
                    $stmt->execute(array($username, $message));
                }

                $db = null;
            }

            header("Location: /index.php");
        ?>
    </body>
</html>