$user = new User();

//// bei drücken des Buttons Nutzer erstellen
    if (isset($_POST['create'])) {

        if ($user) {
            $pass_options = [

                'cost' => 10
            ];
            $user->username = $_POST['username'];
            $user->first_name = $_POST['first_name'];
            $user->last_name = $_POST['last_name'];
            $user->password = password_hash($_POST['password'], PASSWORD_BCRYPT, $pass_options);

            $user->set_file($_FILES['user_image']);

            $user->upload_photo();
            echo ("Der Nutzer {$user->username} wurde erstellt");
            $user->save();
            redirect("admin/login.php");
        }
    }