如何将当前的mysqli过程方式更改为可以调用存储过程的pdo方式

$dsn = 'mysql:host=localhost;dbname=your_database';
$username = 'your_username';
$password = 'your_password';

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

$sql = "CALL your_stored_procedure(?, ?)";

$param1 = 'value1';
$param2 = 'value2';

$stmt = $pdo->prepare($sql);
$stmt->bindParam(1, $param1, PDO::PARAM_STR);
$stmt->bindParam(2, $param2, PDO::PARAM_STR);

$stmt->execute();

$result = $stmt->fetchAll(PDO::FETCH_ASSOC);

$pdo = null;