What does this character represent?

[atticus]

I am looking for documentation on what the -> means as in the following code:

 

$user = json_decode(file_get_contents(
    'https://graph.facebook.com/me?wrap_access_token=' .
    $cookie['oauth_access_token']))->me;
register_user($user->id, $user->email, $user->name, $user->username,
              $user->birthday_date);

 

I am not sure why I am having trouble grabbing the data in the variable.

 

[Mchl]

http://php.net/manual/en/language.oop5.php