这几个代码要如何调试呢？

              <h4 class="tit"><span>大家都爱看</span></h4>
              <?php if(isset($flaglist[3]) && $_flag = $flaglist[3]) foreach($_flag['list'] as $_thread) { ?>
        <?php if ($_thread['icon']) { ?>
              <a href="<?php echo '/'.$_thread['url']; ?>" class="imgLeft_tops01"><img src='<?php echo $_thread['icon_fmt']; ?>' border='0' width='120' height='120' alt='<?php echo $_thread['subject'];?>'><span><?php echo $_thread['subject'];?></span></a><?php } ?><?php } ?>
        <?php if(isset($flaglist[2]) && $_flag = $flaglist[2]) foreach($_flag['list'] as $_thread) { ?>
        <?php if ($_thread['icon']) { ?>
              <a href="<?php echo $_thread['url']; ?>" class="imgLeft_tops02"><em class="c2_em<?php echo $_thread['i'];?>"><?php echo $_thread['i'];?></em><?php echo $_thread['subject'];?><i><?php echo $_thread['views'];?>热度</i></a><?php } ?><?php } ?>
              </div>
              <div class="imgLeft_top imgLeft_top_x">
                  <h4 class="tit"><span>热门推荐</span></h4>
    <?php if(!empty($flaglist)){foreach($flaglist as &$_flag) { ?>
    <?php if(isset($_flag['list'])){foreach($_flag['list'] as $_thread) { ?>
                  <a href="<?php echo $_thread['url'];?>"><em><img src='<?php echo $_thread['icon_fmt'];?>' border='0' width='120' height='120' alt='<?php echo $_thread['subject'];?>'></em><span><?php echo $_thread['subject'];?></span></a><?php }} ?><?php }} ?>
              </div>
          </div>
          <div class="fixed">
             <div class="imgLeft_top imgLeft_top_x">
                  <h4 class="tit"><span>精选推荐</span></h4>
                  <?php if ($_thread['icon']) { ?>
                  <a href="<?php echo $_thread['url']; ?>"><em><img src='<?php echo $_thread['icon_fmt'];?>' border='0' width='120' height='120' alt='<?php echo $_thread['subject'];?>'></em><span><?php echo $_thread['subject'];?></span></a><?php } ?>
              </div>
          </div>

大家都在看：调试为按照点击率

热门推荐：调试为顶置

精选推荐：调试随机

应该要怎么操作呢？第一次用well很多都不懂，有没大哥懂的？