function search_attachments_by_filename($where, $query) { global $wpdb; if ($query->is_search() && !is_admin()) { $search_term = $query->get(‘s’); $where .= ” OR ({$wpdb->posts}.post_type = ‘attachment’ AND {$wpdb->posts}.post_title LIKE ‘%” . esc_sql($search_term) . “%’)”; } return $where; } add_filter(‘posts_where’, ‘search_attachments_by_filename’, 10, 2);