如何将此代码从mysqli更改为PDO

$dsn = "mysql:host=localhost;dbname=mydatabase";
$username = "myusername";
$password = "mypassword";

try {
    $pdo = new PDO($dsn, $username, $password);
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

$stmt = $pdo->prepare("SELECT * FROM mytable WHERE id = :id");
$stmt->bindParam(':id', $id);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);

$stmt = $pdo->prepare("INSERT INTO mytable (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

$row = $stmt->fetch(PDO::FETCH_ASSOC);

$pdo = null;