如果我有一个YYYY-DD-MM格式的PHP字符串和MySQL中的时间戳,有没有一种很好的方法在它们之间进行转换？

$dateString = "2022-01-01";
$timestamp = strtotime($dateString);

SELECT FROM_UNIXTIME(timestamp, '%Y-%m-%d') AS date_string FROM my_table;

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "my_db";

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

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

// 准备SQL语句
$stmt = $conn->prepare("INSERT INTO my_table (date_string) VALUES (?)");

// 绑定参数
$stmt->bind_param("s", $dateString);

// 设置参数并执行查询
$dateString = "2022-01-01";
$stmt->execute();

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

$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "my_db";

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // 准备SQL语句
    $stmt = $conn->prepare("INSERT INTO my_table (date_string) VALUES (:dateString)");

    // 绑定参数
    $stmt->bindValue(':dateString', "2022-01-01");

    // 执行查询
    $stmt->execute();
} catch(PDOException $e) {
    echo "Error: " . $e->getMessage();
}

// 关闭连接
$conn = null;