php怎么从数据库打印出图片

<?php
    require "DBDA.class.php";//调用封装类
    $db = new DBDA();
    $sql = "select * from book";
    $arr= $db->query($sql);
    foreach($arr as $v) // 遍历出各个列的内容
    {
        //图片用img标签获取路径，因为遍历出的img是$v[5]，所以路径就是$v[5]
        echo "<div id=&#39;hang&#39;><a href=&#39;gouwu.php?bkid={$v[0]}&#39;><img width=&#39;60%&#39; height=&#39;250px&#39; src=&#39;{$v[5]}&#39;></a>
              <div class=&#39;jg&#39;><a href=&#39;gouwu.php?bkid={$v[0]}&#39;>{$v[1]}</a></div>
              <div class=&#39;jg&#39; style=&#39;color:red&#39;>{$v[3]}元</div>
              </div>
              ";
              
    }

?>