function addFriend()
{
$id = max(0, (int) $_POST['id']);
$current_user = new CurrentUser();
if ($current_user->authorized) {
if ($current_user->id != $id) {
$user_following = $current_user->getFollowing();
$friend = Users::getById($id);
/* @var $friend User */
$friend_followers = $friend->getFollowers();
$user_following[$id] = $id;
$friend_followers[$current_user->id] = $current_user->id;
$current_user->setFollowing($user_following);
$friend->setFollowers($friend_followers);
$friend->onNewFollower($current_user->id);
$current_user->onNewFollowing($id);
$friend->save();
$current_user->save();
}
}
}