示例类

use Symfony\Component\OptionsResolver\OptionsResolver;

class Email
{
    private $options;

    /**
     * Email constructor.
     *
     * @param  array  $options
     */
    public function __construct(array $options = [])
    {
        $this->setOptions($options);
    }

    /**
     * Configuration options.
     *
     * @param \Closure $closure
     * @param null     $object
     *
     * @return array
     */
    protected function configureOptions(array $options, Closure $closure, $object = null)
    {
        $resolver = new OptionsResolver();

        $closure($resolver);

        if ($object instanceof Closure) {
            return $object()->options = $resolver->resolve($options);
        }

        if (is_object($object)) {
            return $object->options = $resolver->resolve($options);
        }

        if (is_string($object) && class_exists($object)) {
            $object = new $object();

            return $object->options = $resolver->resolve($options);
        }

        return $resolver->resolve($options);
    }

    /**
     * @return mixed
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * @param  array  $options
     */
    public function setOptions(array $options): void
    {
        $this->options = $this->configureOptions($options, function (OptionsResolver $resolver) {
            $resolver->setDefaults([
                'host' => 'smtp.example.org',
                'username' => 'user',
                'password' => 'password',
                'port' => 25,
            ]);
            $resolver->setRequired(['host', 'username', 'password', 'port']);
            $resolver->setAllowedTypes('host', 'string');
            $resolver->setAllowedTypes('username', 'string');
            $resolver->setAllowedTypes('password', 'string');
            $resolver->setAllowedTypes('port', 'int');
        });
    }
}

选项通过校验

$email = new Email([
    'host'     => 'smtp.example.org',
    'username' => 'user',
    'password' => 'password',
    'port'     => 25,
]);

var_export($email);

Email::__set_state(array(
    'options' =>
        array (
            'host' => 'smtp.example.org',
            'username' => 'user',
            'password' => 'password',
            'port' => 25,
        ),
))

选项未通过校验

$email = new Email([
    'host'     => 'smtp.example.org',
    'username' => 'user',
    'password' => 'password',
    'port'     => '25', // 注意这里
]);

var_export($email);

PHP Fatal error:  Uncaught Symfony\Component\OptionsResolver\Exception\InvalidOptionsException: The option "port" with value "25" is expected to be of type "int", but is of type "string".

总结

个人觉得可使用该 symfony/options-resolver 组件较好的对开发第三方 sdk 的客户端类初始化参数进行校验，例如个人适配的 Yii 极光推送扩展包 - yii-jpush 中的应用。