/**
* Changes visibility of a user.
*/
public function changeVisibility()
{
checkUnauthorizedAccess();
$userid = UserRepository::getIdByUsername($_SESSION['username']);
$user = UserRepository::getUserByID($userid);
if ($user['visibility'] == 1) {
UserRepository::hideFromUsersList($userid);
redirect(Route::get("listUsers")->generate());
} else {
UserRepository::showInUsersList($userid);
redirect(Route::get("listUsers")->generate());
}
}