[Code Monkey]

Try this

PHP Code:

$foruminfo = array();
$foruminfo['forumid'] = $forumid;
build_forum_counters($foruminfo['forumid']); 


EDIT: After reading your edit.
Why create all those variables in memory? Just do this

PHP Code:

$threaddm = new vB_DataManager_Thread_FirstPost($vbulletin, ERRTYPE_STANDARD);
$foruminfo['forumid'] = '2';

$threaddm->do_set('forumid', $foruminfo['forumid']);
$threaddm->do_set('postuserid', $userid);
$threaddm->do_set('userid', $userid);
$threaddm->do_set('username', $username);
$threaddm->do_set('pagetext', $article;
$threaddm->do_set('title', $title);
$threaddm->do_set('allowsmilie', '1');
$threaddm->do_set('visible', '1');
$done = $threaddm->save();

build_forum_counters($foruminfo['forumid']);