게시판이 기본적으로 글 올린 순서대로 정렬이 되는데

<select id="bo_sort_field" name="bo_sort_field">                    <option value="" <?php echo get_selected($board['bo_sort_field'], ""); ?>>wr_num, wr_reply : 기본</option><option value="wr_good asc" <?php echo get_selected($board['bo_sort_field'], "wr_good asc"); ?>>wr_datetime asc : 추천수 오름차순</option>​<option value="wr_good desc" <?php echo get_selected($board['bo_sort_field'], "wr_good desc"); ?>>wr_datetime asc : 추천수 내림차순</option>​​                    <option value="wr_datetime asc" <?php echo get_selected($board['bo_sort_field'], "wr_datetime asc"); ?>>wr_datetime asc : 날짜 이전것 부터</option>                    <option value="wr_datetime desc" <?php echo get_selected($board['bo_sort_field'], "wr_datetime desc"); ?>>wr_datetime desc : 날짜 최근것 부터</option>                    <option value="wr_hit asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_hit asc, wr_num, wr_reply"); ?>>wr_hit asc : 조회수 낮은것 부터</option>                    <option value="wr_hit desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_hit desc, wr_num, wr_reply"); ?>>wr_hit desc : 조회수 높은것 부터</option>                    <option value="wr_last asc" <?php echo get_selected($board['bo_sort_field'], "wr_last asc"); ?>>wr_last asc : 최근글 이전것 부터</option>                    <option value="wr_last desc" <?php echo get_selected($board['bo_sort_field'], "wr_last desc"); ?>>wr_last desc : 최근글 최근것 부터</option>                    <option value="wr_comment asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_comment asc, wr_num, wr_reply"); ?>>wr_comment asc : 댓글수 낮은것 부터</option>                    <option value="wr_comment desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_comment desc, wr_num, wr_reply"); ?>>wr_comment desc : 댓글수 높은것 부터</option>                    <option value="wr_good asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_good asc, wr_num, wr_reply"); ?>>wr_good asc : 추천수 낮은것 부터</option>                    <option value="wr_good desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_good desc, wr_num, wr_reply"); ?>>wr_good desc : 추천수 높은것 부터</option>                    <option value="wr_nogood asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_nogood asc, wr_num, wr_reply"); ?>>wr_nogood asc : 비추천수 낮은것 부터</option>                    <option value="wr_nogood desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_nogood desc, wr_num, wr_reply"); ?>>wr_nogood desc : 비추천수 높은것 부터</option>                    <option value="wr_subject asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_subject asc, wr_num, wr_reply"); ?>>wr_subject asc : 제목 내림차순</option>                    <option value="wr_subject desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_subject desc, wr_num, wr_reply"); ?>>wr_subject desc : 제목 오름차순</option>                    <option value="wr_name asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_name asc, wr_num, wr_reply"); ?>>wr_name asc : 글쓴이 내림차순</option>                    <option value="wr_name desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "wr_name desc, wr_num, wr_reply"); ?>>wr_name desc : 글쓴이 오름차순</option>                    <option value="ca_name asc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "ca_name asc, wr_num, wr_reply"); ?>>ca_name asc : 분류명 내림차순</option>                    <option value="ca_name desc, wr_num, wr_reply" <?php echo get_selected($board['bo_sort_field'], "ca_name desc, wr_num, wr_reply"); ?>>ca_name desc : 분류명 오름차순</option>                </select>