갤러리 리스트 썸네일 추출 3개 하려고 합니다(첨부파일) 도와주세요~!

<li class="gall_li <?php if ($wr_id == $list[$i]['wr_id']) { ?>gall_now<?php } ?>" style="width:320px">        </li>            <label for="chk_wr_id_<?php echo $i ?>" class="sound_only"><?php echo $list[$i]['subject'] ?></label>            <input type="checkbox" name="chk_wr_id[]" value="<?php echo $list[$i]['wr_id'] ?>" id="chk_wr_id_<?php echo $i ?>">            <?php } ?>            <span class="sound_only">                <?php                if ($wr_id == $list[$i]['wr_id'])                    echo "<span class=\"bo_current\">열람중</span>";                else                    echo $list[$i]['num'];                 ?>            </span>            <ul class="gall_con">                <li id="gall_href_<?php echo $list[$i]['wr_id']; ?>" class="gall_href">                 <div class="response_thumbnail">      <div class="response_pc">      <a href="<?php echo $list[$i]['href'] ?>">      <?php      if ($list[$i]['is_notice']) { // 공지사항  ?>       <strong style="width:<?php echo $board['bo_gallery_width'] ?>px;height:<?php echo $board['bo_gallery_height'] ?>px">공지</strong>      <?php } else {       $thumb = get_list_thumbnail($board['bo_table'], $list[$i]['wr_id'], $board['bo_gallery_width'], $board['bo_gallery_height'] );       if($thumb['src']) {        $img_content = '<img src="'.$thumb['src'].'" alt="'.$thumb['alt'].'">';       } else {        $img_content = '<span>no image</span>';       }       echo $img_content;      }       ?>       </a>      </div>      <div class="response_tablet">      <a href="<?php echo $list[$i]['href'] ?>">      <?php      if ($list[$i]['is_notice']) { // 공지사항  ?>       <strong style="width:<?php echo $board['bo_gallery_width'] ?>px;height:<?php echo $board['bo_gallery_height'] ?>px">공지</strong>      <?php } else {       $thumb = get_list_thumbnail($board['bo_table'], $list[$i]['wr_id'], $board['bo_gallery_width'], $board['bo_gallery_height'] );       if($thumb['src']) {        $img_content = '<img src="'.$thumb['src'].'" alt="'.$thumb['alt'].'">';       } else {        $img_content = '<span>no image</span>';       }       echo $img_content;      }       ?>       </a>      </div>      <div class="response_mobile">      <a href="<?php echo $list[$i]['href'] ?>">      <?php      if ($list[$i]['is_notice']) { // 공지사항  ?>       <strong style="width:<?php echo $board['bo_gallery_width'] ?>px;height:<?php echo $board['bo_gallery_height'] ?>px">공지</strong>      <?php } else {       $thumb = get_list_thumbnail($board['bo_table'], $list[$i]['wr_id'], $board['bo_gallery_width'], $board['bo_gallery_height'] );       if($thumb['src']) {        $img_content = '<img src="'.$thumb['src'].'" alt="'.$thumb['alt'].'">';       } else {        $img_content = '<span>no image</span>';       }       echo $img_content;      }       ?>       </a>      </div>     </div>     <h3 class="response_title">반응형 홈페이지</h3>     <p class="response_tit">      <a href="<?php echo $list[$i]['href'] ?>">      <?php echo $list[$i]['subject'] ?>      </a>     </p>     <dl class="response_txt">      <dt>분야</dt>      <dd><?php echo $list[$i]['wr_1'] ?></dd>      <dt>사이트</dt>      <dd><a href="<?php echo $list[$i]['wr_link1'] ?>" target="_blank"><?php echo $list[$i]['wr_link1'] ?></a></dd>      <dt>제작업체</dt>      <dd><?php echo $list[$i]['wr_2'] ?></dd>     </dl>                </li>    <!--                <li><span class="gall_subject">작성자 </span><?php echo $list[$i]['name'] ?></li>                <li><span class="gall_subject">작성일 </span><?php echo $list[$i]['datetime2'] ?></li>                -->                <!--li><span class="gall_subject">조회 </span><?php echo $list[$i]['wr_hit'] ?></li-->                <?php if ($is_good) { ?><li><span class="gall_subject" id="like">추천</span><strong><?php echo $list[$i]['wr_good'] ?></strong></li><?php } ?>                <?php if ($is_nogood) { ?><li><span class="gall_subject">비추천</span><strong><?php echo $list[$i]['wr_nogood'] ?></strong></li><?php } ?>            </ul>        </li>​