public function getUserFollowers($userId, $maxId)
{
if (!$this->isLoggedIn()) {
throw new InstagramException("You must be logged in to call getUserFollowers().");
}
if ($userId instanceof User) {
$userId = $userId->getPk();
}
$request = new FollowersFriendshipRequest($this, $userId, $maxId);
$response = $request->execute();
if (!$response->isOk()) {
throw new InstagramException(sprintf("Failed to getUserFollowers: [%s] %s", $response->getStatus(), $response->getMessage()));
}
return $response;
}