使用PHP,MySQLi和Prepared Statement,我如何返回插入行的id？

<?php
// 连接到MySQL数据库
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

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

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

// 创建预处理语句
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

// 设置参数并执行
$username = "John";
$email = "john@example.com";
$stmt->execute();

// 获取插入行的ID
$inserted_id = $stmt->insert_id;

echo "插入行的ID: " . $inserted_id;

// 关闭语句和连接
$stmt->close();
$conn->close();
?>