[Marco van Herwaarden]

$tresult != $result

Use $tresult[anzahl] in your postbit.
If it still don't show, add the following line to the top of your plugin:

PHP Code:

global $tresult; 


PS A much better/nicer way of doing this would be:

PHP Code:

$tresult = $vbulletin->db->query_first("SELECT COUNT(*) AS anzahl FROM ". TABLE_PREFIX ."thread WHERE forumid IN (1,4,8) AND postuserid=".$post['userid']."");  
$post['anzahl'] = $tresult['anzahl']; 


This is because $post is the array that is used everywhere else to store the values of a single post.

Please also note that this should be optimized to avoid performance issues. Your plugin (and the query inside) will be executed for each post on a page, also if the same member has posted more then once on the same page. It would be better to retrieve the values of each user that has posted only once.