PHP MySQL :如何将写入PHP的数据添加到Mysql数据库

<?php
$servername = "localhost"; // MySQL服务器地址
$username = "username"; // MySQL用户名
$password = "password"; // MySQL密码
$dbname = "database"; // 数据库名称

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

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

<?php
$name = "John Doe";
$email = "johndoe@example.com";

$sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
?>

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

<?php
$conn->close();
?>