Fixed MANTIS-4703 (Fix Twitter syndication (URL shortener service))

        // Shorten message for Twitter purposes

        $chopped_message = strip_html($message->evaluate());

        $max_length = 255;

        $shortened_link = mixed();

        $max_length = 255; // Originally 140, could be 280, but 255 seems more reasonable. IDEA: Make configurable

        if ($link != '') {

            $shortened_link = http_download_file('http://is.gd/api.php?longurl=' . urlencode($link));

            $max_length -= strlen($shortened_link) + 1;

            $max_length -= max(strlen($link), 23) + 1; // 23 is documented length of a link from Twitter URL shortener

        }

        if (cms_mb_strlen($chopped_message) > $max_length) {

            $chopped_message = substr($chopped_message, 0, $max_length - 3) . '...';

        }

        if ($link != '') {

            $chopped_message .= ' ' . $shortened_link;

            $chopped_message .= ' ' . $link;

        }

        require_code('character_sets');

        $chopped_message = convert_to_internal_encoding($chopped_message, get_charset(), 'utf-8');