如何利用php语法实现留言板的回复功能（前后端结合）

前端代码：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>留言板</title>
  <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
  <div class="container">
    <h2>留言板</h2>
    <form class="form-horizontal" method="post" action="post_message.php">
      <div class="form-group">
        <label for="username" class="col-sm-2 control-label">姓名：</label>
        <div class="col-sm-10">
          <input type="text" name="username" class="form-control" required>
        </div>
      </div>
      <div class="form-group">
        <label for="content" class="col-sm-2 control-label">留言内容：</label>
        <div class="col-sm-10">
          <textarea name="content" class="form-control" rows="5" required></textarea>
        </div>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <button type="submit" class="btn btn-primary">提交</button>
        </div>
      </div>
    </form>
    <?php
      // 查询留言列表
      $sql = "SELECT * FROM message ORDER BY created_at DESC";
      $result = mysqli_query($conn, $sql);
      while ($row = mysqli_fetch_assoc($result)) {
    ?>
    <div class="panel panel-default">
      <div class="panel-heading">
        <?php echo $row['username']; ?>（<?php echo $row['created_at']; ?>）
      </div>
      <div class="panel-body">
        <?php echo $row['content']; ?>
      </div>
    </div>
    <?php
        // 查询回复列表
        $sql = "SELECT * FROM reply WHERE message_id = {$row['id']} ORDER BY created_at ASC";
        $result2 = mysqli_query($conn, $sql);
        while ($row2 = mysqli_fetch_assoc($result2)) {
    ?>
    <div class="panel panel-info">
      <div class="panel-heading">
        <?php echo $row2['username']; ?>（<?php echo $row2['created_at']; ?>）
      </div>
      <div class="panel-body">
        <?php echo $row2['content']; ?>
      </div>
    </div>
    <?php
    }
     ?>
    <form class="form-horizontal" method="post" action="post_reply.php">
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <input type="hidden" name="message_id" value="<?php echo $row['id']; ?>">
          <input type="text" name="username" class="form-control" placeholder="回复者姓名" required>
        </div>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <textarea name="content" class="form-control" rows="3" placeholder="回复内容" required></textarea>
        </div>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <button type="submit" class="btn btn-default">回复</button>
        </div>
      </div>
    </form>
    <?php
    }
     ?>
  </div>
</body>
</html>

后端代码：

<?php
// 建立数据库连接
$conn = new mysqli("localhost", "root", "password", "test");
if ($conn->connect_error) {
  die("数据库连接失败：" . $conn->connect_error);
}
 
// 定义Message类
class Message {
  public $id;
  public $username;
  public $content;
  public $created_at;
  public $updated_at;
   
  // 构造函数
  function __construct($id, $username, $content, $created_at, $updated_at) {
    $this->id = $id;
    $this->username = $username;
    $this->content = $content;
    $this->created_at = $created_at;
    $this->updated_at = $updated_at;
  }
   
  // 静态方法：获取留言列表
  static function get_list($conn) {
    $messages = array();
    $sql = "SELECT * FROM message ORDER BY created_at DESC";
    $result = mysqli_query($conn, $sql);
    while ($row = mysqli_fetch_assoc($result)) {
      $message = new Message($row['id'], $row['username'], $row['content'], $row['created_at'], $row['updated_at']);
      array_push($messages, $message);
    }
    return $messages;
   }
}
 
// 定义Reply类
class Reply {
  public $id;
  public $message_id;
  public $username;
  public $content;
  public $created_at;
  public $updated_at;
   
  // 构造函数
  function __construct($id, $message_id, $username, $content, $created_at, $updated_at) {
    $this->id = $id;
    $this->message_id = $message_id;
    $this->username = $username;
    $this->content = $content;
    $this->created_at = $created_at;
    $this->updated_at = $updated_at;
  }
  
  // 静态方法：根据留言ID获取回复列表
  static function get_list_by_message_id($conn, $message_id) {
    $replies = array();
    $sql = "SELECT * FROM reply WHERE message_id = {$message_id} ORDER BY created_at ASC";
    $result = mysqli_query($conn, $sql);
    while ($row = mysqli_fetch_assoc($result)) {
      $reply = new Reply($row['id'], $row['message_id'], $row['username'], $row['content'], $row['created_at'], $row['updated_at']);
      array_push($replies, $reply);
    }
    return $replies;
  }
}
 
// 处理留言提交
if ($_SERVER['REQUEST_METHOD'] == 'POST' && !empty($_POST['username']) && !empty($_POST['content'])) {
  $sql = "INSERT INTO message (username, content) VALUES ('{$_POST['username']}', '{$_POST['content']}')";
  mysqli_query($conn, $sql);
}
 
// 处理回复提交
if ($_SERVER['REQUEST_METHOD'] == 'POST' && !empty($_POST['message_id']) && !empty($_POST['username']) && !empty($_POST['content'])) {
  $sql = "INSERT INTO reply (message_id, username, content) VALUES ({$_POST['message_id']}, '{$_POST['username']}', '{$_POST['content']}')";
  mysqli_query($conn, $sql);
}

// 获取留言列表
$messages = Message::get_list($conn);
?>

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标签： php语法, 留言板回复功能

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