в обновлённой инструкции опять теже грабли.
$cat_id = $forum_data['cat_id'];
$cat_name = $forums['cat_title_html'][$forum_data['cat_id']];
'CAT_ID' => $cat_id,
'CAT_NAME' => htmlCHR($cat_name),
'CAT_ID' => $forum_data['cat_id'],
'CAT_NAME' => $forums['cat_title_html'][$forum_data['cat_id']],