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

It is called an interface. Many OO languages have this feature. You might want to read through the php explanation here: http://de2.php.net/interface