如何使用带有PHP的Prepared Statement插入到mysql中

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

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

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

// 创建Prepared Statement
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");

// 绑定参数
$stmt->bind_param("ss", $username, $email);

// 设置参数
$username = "John";
$email = "john@example.com";

// 执行Prepared Statement
$stmt->execute();

// 检查插入是否成功
if ($stmt->affected_rows > 0) {
    echo "插入成功";
} else {
    echo "插入失败";
}

// 关闭Prepared Statement和数据库连接
$stmt->close();
$conn->close();
?>