$userRepo = new UserRepositoryService();
$userId = $_SESSION['id'];
$wallId = $userRepo->getWallIdById($userId);
//$privacity = isset($_POST['change']) ? $_POST['change'] : $wallRepo -> getPrivacityById($wallId);
$privacity = $wallRepo->getPrivacityById($wallId);
$checkedPrivate = "";
$checkedSemiPrivate = "";
$checkedNormal = "";
$checkedSemiPublic = "";
$checkedPublic = "";
$usersPrivate = null;
$usersSemiPrivate = null;
switch ($privacity) {
    case 'privado':
        $checkedPrivate = "checked";
        $usersPrivate = $wallRepo->getUsersById($wallId);
        break;
    case 'semiprivado':
        $checkedSemiPrivate = "checked";
        $usersSemiPrivate = $wallRepo->getUsersById($wallId);
        break;
    case 'normal':
        $checkedNormal = "checked";
        break;
    case 'semipublico':
        $checkedSemiPublic = "checked";
        break;
    case 'publico':
        $checkedPublic = "checked";
        break;
}