Observer Pattern Example in PHP
================================
 - ArticleAggregator created
 - Added NewsObverser & GossipObserver

NewsFlash: celebrity rugby player loves finance
================================================
NewsObserver finds: celebrity rugby player loves finance
GossipObserver finds: celebrity rugby player loves finance

 - SportObserver has found out and wants to join the group!

NewsFlash: government messes up again!
=======================================
NewsObserver finds: government messes up again!

NewsFlash: fashion and football combine
=======================================
GossipObserver finds: fashion and football combine
SportObserver finds: fashion and football combine

NewsFlash: music and politics, what next?
==========================================
NewsObserver finds: music and politics, what next?
GossipObserver finds: music and politics, what next?

 - GossipObserver is bored and leaves the group!

NewsUpdate: fashion and football combine says government
=========================================================
NewsObserver finds: fashion and football combine says government
SportObserver finds: fashion and football combine says government