if(isset($_POST['btnEnviar'])){
        $sql        = "SELECT id, login, senha, nome FROM usuario WHERE login = '$login' AND senha = '$senha'";
        $consulta   = $conexao->consulta($sql);
        $row        = $conexao->busca($consulta);
        $total      = $conexao->conta($consulta);

        if($total == 1){
            $_SESSION['login'] = $login;
            $_SESSION['senha'] = $senha;
            //echo "<script language= 'JavaScript'> location.href='/dashboard'; </script>";
            header("Location: /dashboard");
        }else{
            session_unset();
            session_destroy();
            echo $alerta1;
        }

        $conexao->desconectar();
    }

$app->get(
    '/login/',
    function () {
        require_once("login.php");
    }
);

$app->get(
    '/dashboard/',
    function () {
        require_once("dashboard.php");
    }
);