Вывод похожих новостей из определённой категории (для DLE 9.8)

            if( $related_buffer === FALSE ) {

[b]                if ($category_id == 17) 
                    $cats12 = " AND category IN (17)";

                elseif ($category_id == 19)
                    $cats12 = " AND category IN (19)";
                    
                else
                    $cats12 = " AND category NOT IN (17) AND category NOT IN (19)";[/b]

                if ( $row['related_ids'] ) {
                    $db->query( "SELECT id, date, short_story, xfields, title, category, alt_name FROM " . PREFIX . "_post WHERE id IN({$row['related_ids']})[b]{$cats12}[/b] ORDER BY id DESC");
                                        
                    $first_show = false;

                } else {
                    $first_show = true;
                    $related_ids = array();
            
                    if( strlen( $row['full_story'] ) < strlen( $row['short_story'] ) ) $body = $row['short_story'];
                    else $body = $row['full_story'];
                    
                    $body = $db->safesql( strip_tags( stripslashes( $metatags['title'] . " " . $body ) ) );
                    
                    $config['related_number'] = intval( $config['related_number'] );
                    if( $config['related_number'] < 1 ) $config['related_number'] = 5;
    
                    $allowed_cats = array();
                    
[b]                    if ($category_id == 17)
                        $allowed_cats = "regexp '[[:<:]](17)[[:>:]]'";

                       elseif ($category_id == 19)
                        $allowed_cats = "regexp '[[:<:]](19)[[:>:]]'";
                        
                        
                    else
                    foreach ($user_group as $value) {
                        if ($value['allow_cats'] != "all" AND !$value['allow_short'] ) 
                            //if ($category_id !== 1) 
                            $allowed_cats[] = $db->safesql($value['allow_cats']);[/b]
                    }

...// какой-то код.

                    $db->query( "SELECT id, date, short_story, xfields, title, category, alt_name FROM " . PREFIX . "_post WHERE MATCH (title, short_story, full_story, xfields) AGAINST ('$body') AND id != " . $row['id'] . " AND approve='1' AND category {$allow_cats}" . $where_date . " LIMIT " . $config['related_number'] );
                }