如何从复选框插入主键

// 前端页面
<form action="insert.php" method="post">
  <input type="checkbox" name="record1" value="Record 1"> Record 1<br>
  <input type="checkbox" name="record2" value="Record 2"> Record 2<br>
  <input type="checkbox" name="record3" value="Record 3"> Record 3<br>
  <input type="submit" value="Submit">
</form>

// 后端代码（insert.php）
<?php
// 连接到数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
  die("连接失败: " . $conn->connect_error);
}

// 处理复选框提交的数据
if(isset($_POST['record1'])) {
  $record1 = $_POST['record1'];
  // 执行插入操作，生成主键值
  $sql = "INSERT INTO your_table (record) VALUES ('$record1')";
  $conn->query($sql);
}

if(isset($_POST['record2'])) {
  $record2 = $_POST['record2'];
  // 执行插入操作，生成主键值
  $sql = "INSERT INTO your_table (record) VALUES ('$record2')";
  $conn->query($sql);
}

if(isset($_POST['record3'])) {
  $record3 = $_POST['record3'];
  // 执行插入操作，生成主键值
  $sql = "INSERT INTO your_table (record) VALUES ('$record3')";
  $conn->query($sql);
}

// 关闭数据库连接
$conn->close();
?>