Repository

class Repository
{
    private $users;

    public function __construct(array $users = array())
    {
        $this->users = $users;
    }

    // A fast ID lookup, probably cached, sometimes we might not need the entire user.
    public function getLastRegisteredUsername()
    {
        if (empty($this->users)) {
            return \PhpOption\None::create();
        }

        return new Some(end($this->users));
    }

    // Returns a user object (we will live with an array here).
    public function getUser($name)
    {
        if (in_array($name, $this->users, true)) {
            return new Some(array('name' => $name));
        }

        return \PhpOption\None::create();
    }

    public function getDefaultUser()
    {
        return array('name' => 'muhuhu');
    }
}