chamilo / chamilo-lms

        $result = Database::query($sql);

        $is_visible = false;

        if (Database::num_rows($result) > 0) {

            $row = Database::fetch_array($result, 'ASSOC');

            if ($row['visibility'] == 1) {

                $is_visible = api_is_allowed_in_course() || api_is_platform_admin();

            }

        }

        /* improved protection of documents viewable directly through the url:

            incorporates the same protections of the course at the url of

                     access_session_id = '$session_id'

                ORDER BY access_date DESC limit 1";

        $rs = Database::query($sql);

        if (Database::num_rows($rs) > 0) {

            $row = Database::fetch_array($rs);

            $date_time = api_convert_and_format_date(

                $row['access_date'],

                null,

                date_default_timezone_get()

            );

        }

        return $date_time;

    }