我正在将PHP PDO与PostgreSQL一起用于一个新项目.
给定以下函数，如何返回刚刚插入的行的id？
function adauga_administrator($detalii) {
global $db;
$ultima_logare = date('Y-m-d');
$stmt = $db->prepare("INSERT INTO site_admins (sa_nume, sa_prenume, sa_user_name, sa_password, sa_email, sa_id_rol, sa_status, sa_ultima_logare) VALUES (?, ?, ?, ?, ?, ?, ?, ?)");
$stmt->bindParam(1, $detalii['nume']);
$stmt->bindParam(2, $detalii['prenume']);
$stmt->bindParam(3, $detalii['username']);
$stmt->bindParam(4, md5(md5($detalii['parola'] . SIGURANTA_PAROLE) . SIGURANTA_PAROLE));
$stmt->bindParam(5, $detalii['email']);
$stmt->bindParam(6, $detalii['rol'], PDO::PARAM_INT);
$stmt->bindParam(7, $detalii['status'], PDO::PARAM_INT);
$stmt->bindParam(8, $ultima_logare);
$stmt->execute();
$id = $db->lastInsertId();
return $id;
}