How to use getters and setters in PHP domain objects and transfer them correctly with Zend_Amf

I just started to use Zend_Amf and thus far I'开发者_开发问答m really happy with it for sending objects from Flash to the server. Sending my objects from the server back to my Flash environment is causing me a slight headache. My PHP objects mostly contain private properties that have a custom getter and setter method. How do I make Zend_Amf aware of these properties? When sending objects from the server back to PHP it just tries. Is there an annotation for this like @property? Any help is much appreciated, for now I'll try to convert the object to an stdClass instance with a $_ecplicitType value.