php表单提交到mysql数据库

<form method="POST" action="submit.php">
  <input type="text" name="name" placeholder="姓名">
  <input type="email" name="email" placeholder="邮箱">
  <textarea name="message" placeholder="留言"></textarea>
  <button type="submit">提交</button>
</form>

<?php
// 获取表单数据
$name = $_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];

// 连接MySQL数据库
$servername = "数据库服务器地址";
$username = "数据库用户名";
$password = "数据库密码";
$dbname = "数据库名称";

$conn = new mysqli($servername, $username, $password, $dbname);

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

// 插入数据到数据库
$sql = "INSERT INTO 表名 (姓名, 邮箱, 留言) VALUES ('$name', '$email', '$message')";

if ($conn->query($sql) === TRUE) {
  echo "数据插入成功";
} else {
  echo "数据插入失败: " . $conn->error;
}

// 关闭数据库连接
$conn->close();
?>