如何使用php将我的星级值发送到mysql数据库？

$host = "localhost";  // MySQL主机地址
$username = "your_username";  // MySQL用户名
$password = "your_password";  // MySQL密码
$dbname = "your_database";  // 数据库名称

// 创建与MySQL数据库的连接
$conn = new mysqli($host, $username, $password, $dbname);

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

// 创建存储星级值的表
$sql = "CREATE TABLE ratings (
    id INT(11) AUTO_INCREMENT PRIMARY KEY,
    user_id INT(11) NOT NULL,
    star_rating INT(11) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
)";

if ($conn->query($sql) === TRUE) {
    echo "成功创建表 'ratings'";
} else {
    echo "创建表时出错: " . $conn->error;
}

// 获取提交的星级值
$starRating = $_POST['star_rating'];

// 插入星级值到数据库表中
$sql = "INSERT INTO ratings (user_id, star_rating) VALUES (1, $starRating)";

if ($conn->query($sql) === TRUE) {
    echo "星级值插入成功";
} else {
    echo "插入星级值时出错: " . $conn->error;
}

// 关闭与数据库的连接
$conn->close();