Symfony 判断用户密码

//input user info
$username = //...
$password = //...
//获取Symfony中用户
$user = $userManager->findOneBy(array('username' => $username));
if ($container->get('security.encoder_factory')->getEncoder($user)->isPasswordValid($user->getPassword(), $password, $user->getSalt())) {
    //密码正确
}