Instagram\Instagram::unlikeMedia PHP Method

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