dtsps2098 2017-09-09 04:45
浏览 38

PHP MySql:为什么我的选择选项不显示下拉列表中的数字?

Why does my select option not display the number in the dropdown select? What's wrong?

<?php
$query = "SELECT * FROM users";
$result = mysqli_query($mysqli, $query);
    if(!$result){
      die('Query FAILED');
}
?>
  <!DOCTYPE html>
  <html>
  <head>
    <meta charset="utf-8">

  </head>
  <body>
   <div class="container">
      <div class="col-xs-6">

      <form action="login_create.php" method="post">
        <div class="form-group">
            <label for="username">Username</label>
            <input type="text" name="username" class="form-control"/>
        </div>
        <div class="form-group">
            <label for="password">Password</label>
            <input type="password" name="password" class="form-control">
        </div>
          <div class="form-group">
            <select name="id" id = " ">
                            <?php
                            while($row = mysqli_fetch_assoc($result)){
                                  $id = $row['id'];
                              echo "<option value='$id'>$id</option>";
                            }
                            ?>
            </select>
          </div>
        <input class="btn btn-primary" type="submit" name="submit" 
value="UPDATE">
         </form>
  </div>
</div>
</body>
</html>
  • 写回答

2条回答 默认 最新

  • drt96856 2017-09-09 04:51
    关注

    Are you connected to the DB, what's this value

    $mysqli
    

    It's never defined/set in your post. Therefore I have to assume you never connected to the DB.

    First place to start always, is turn on error reporting

    <?php
         ini_set('display_errors', 1);
         error_reporting(-1); //or E_ALL
         ... other code ...
    

    If you do that and it says, something like.

    Warning undefined variable $mysql

    Then you will know.

    评论

报告相同问题?

悬赏问题

  • ¥15 Mac系统vs code使用phpstudy如何配置debug来调试php
  • ¥15 目前主流的音乐软件,像网易云音乐,QQ音乐他们的前端和后台部分是用的什么技术实现的?求解!
  • ¥60 pb数据库修改与连接
  • ¥15 spss统计中二分类变量和有序变量的相关性分析可以用kendall相关分析吗?
  • ¥15 拟通过pc下指令到安卓系统,如果追求响应速度,尽可能无延迟,是不是用安卓模拟器会优于实体的安卓手机?如果是,可以快多少毫秒?
  • ¥20 神经网络Sequential name=sequential, built=False
  • ¥16 Qphython 用xlrd读取excel报错
  • ¥15 单片机学习顺序问题!!
  • ¥15 ikuai客户端多拨vpn,重启总是有个别重拨不上
  • ¥20 关于#anlogic#sdram#的问题,如何解决?(关键词-performance)