Alright, it was just missing TABLE_PREFIX's but I added them and cleaned up the code.
In register.php find:
PHP Code:
$userid = $DB_site->insert_id();
After add:
PHP Code:
// get hold of his posts and update threads
$DB_site->query("UPDATE " . TABLE_PREFIX . "post SET userid='$userid' WHERE username='".addslashes(htmlspecialchars($_POST['username']))."' AND visible<>0");
$DB_site->query("UPDATE " . TABLE_PREFIX . "thread SET postuserid='$userid' WHERE postusername='".addslashes(htmlspecialchars($_POST['username']))."' AND visible<>0");
$totalposts=$DB_site->query_first("SELECT COUNT(postid) AS posts FROM " . TABLE_PREFIX . "post WHERE userid='$userid'");
$DB_site->query("UPDATE " . TABLE_PREFIX . "user SET posts='$totalposts[posts]' WHERE userid='$userid'");