提交表单未将数据存储到数据库

<?php
// 假设表单数据通过POST方法提交
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // 获取表单数据
    $name = $_POST['name'];
    $email = $_POST['email'];

    // 创建数据库连接
    $conn = new mysqli("localhost", "username", "password", "database_name");

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

    // 准备SQL语句
    $sql = "INSERT INTO users (name, email) VALUES (?, ?)";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("ss", $name, $email);

    // 执行SQL语句
    if ($stmt->execute()) {
        echo "新记录插入成功";
    } else {
        echo "Error: " . $sql . "<br>" . $stmt->error;
    }

    // 关闭连接
    $stmt->close();
    $conn->close();
}
?>

<!-- 表单HTML代码 -->
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
  名称: <input type="text" name="name">
  <br><br>
  邮箱: <input type="text" name="email">
  <br><br>
  <input type="submit">
</form>