[TECK]

Please, always post a link to the actual hack, if you want help faster. You are lucky that I knew the coder's hack.
Did you ran the query to create the needed table?

Use this code:

$shout = $DB_site->query_first("
  SELECT shoutbox.*,user.username
  FROM shoutbox
  LEFT JOIN user USING( userid )
  ORDER BY shoutbox.timestamp DESC LIMIT 1
");