php select form 显示查询数据

<?php/** * Created by PhpStorm. * User: Administrator * Date: 2015/3/31 * Time: 16:13 */header("Content-Type:text/html;charset=utf8"); require_once("conn.php");  $sql="select * from txt";//选择表的SQL指令  $result=mysql_query($sql);//得到查询的结果数据集  while($row=mysql_fetch_array($result))  {      echo "用户名：".$row['username']."<br/>";      echo "密码：".$row['password']."<br/>";      echo "邮箱：".$row['email']."<br/>";      echo "注册时间：".date("Y-m-d",$row['regdate'])."<br/>";  }?>