public function add()
    {
        $user = new User();
        $title = 'Add user';
        $errors = [];

        //Check errors when posting
        if(!empty($_POST)){

            if( !preg_match('/^[A-Za-z ]+$/', $_POST['fullname'])){
                $errors["fullname"] = "Fullname is required";
            }

            if(!is_null('email') && !filter_var($_POST["email"], FILTER_VALIDATE_EMAIL)) {
                $errors["email"] = "Email is required";
            }

            if(strlen($_POST["password"]) < 8){
                $errors["password"] = "Password is required";
            }

            if(strcmp($_POST["password"], $_POST["password_confirmation"])!=0){
                $errors["password_confirmation"] = "Password confirmation must be equal to password";
            }

            $user_type = $_POST['user_type'] ?? null;

            if( is_null($user_type) || $user_type <0 || $user_type > 2){
                    $errors["user_type"] = "Type is required";
            }

            //se nao houver erros gg
            if(!$errors){
                User::add($user = new User($_POST));
            }

            if (isset($_POST['cancel'])){
                return header('Location: user.php');
            }
        }
        return render_view('users.add', compact('title', 'user', 'errors'));
    }