What does “implements” do on a class?

Question

If a class implements another class... what does that mean? I found this code sample: http://www.java2s.com/Code/Php/Class/extendsandimplement.htm

But unfortunately

Answer 1

In Java a class can implement an interface. See http://en.wikipedia.org/wiki/Interface_(Java) for more details. Not sure about PHP.

Hope this helps.