After severals years of research, I was finally able to adapt some concepts of the Java World to my beloved PHP Scripts.
The first concept I sucessfully translated to the world of scripting languages was the so called "Plain Old Java Object".
Basically the idea behind this concept, as I understand it is to find a new denomination for some old shit. Thus it sounds more relevant!
Here is a complete code you need to implement this astonishing new concept even in your existing PHP-Code.
After implementing this revolutionary interface into your code, you will be able to implement into your existing value objects like this:
Belive it or not, that's just it! You can use the above code as much as you want. Feel free to suite to your needs, but don't forget to put some copyright notice in it that praises ma as new messias of coding!