list.sort.skin.php 에 있는 $sca, $sfl, $stx 가 뭔지 알고 싶습니다. 채택완료

</p><p><fieldset id="bo_sch"></p><p>    <legend>게시물 검색</legend></p><p> </p><p>    <form name="fsearch" method="get"></p><p>    <input type="hidden" name="ca_id" value="<?php echo $bo_table ?>"></p><p>    <input type="hidden" name="sca" value="<?php echo $sca ?>"></p><p>    <input type="hidden" name="sop" value="and"></p><p>    <label for="sfl" class="sound_only">검색대상</label></p><p>    <select name="sfl" id="sfl"></p><p>        <option value="wr_subject"<?php echo get_selected($sfl, 'wr_subject', true); ?>>제목</option></p><p>        <option value="wr_content"<?php echo get_selected($sfl, 'wr_content'); ?>>내용</option></p><p>        <option value="wr_subject||wr_content"<?php echo get_selected($sfl, 'wr_subject||wr_content'); ?>>제목+내용</option></p><p>        <option value="mb_id,1"<?php echo get_selected($sfl, 'mb_id,1'); ?>>회원아이디</option></p><p>        <option value="mb_id,0"<?php echo get_selected($sfl, 'mb_id,0'); ?>>회원아이디(코)</option></p><p>        <option value="wr_name,1"<?php echo get_selected($sfl, 'wr_name,1'); ?>>글쓴이</option></p><p>        <option value="wr_name,0"<?php echo get_selected($sfl, 'wr_name,0'); ?>>글쓴이(코)</option></p><p>    </select></p><p>    <label for="stx" class="sound_only">검색어<strong class="sound_only"> 필수</strong></label></p><p>    <input type="text" name="stx" value="<?php echo stripslashes($stx) ?>" required id="stx" class="frm_input required" size="15" maxlength="20"></p><p>    <input type="submit" value="검색" class="btn_submit"></p><p>    </form></p><p></fieldset></p><p>