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Observer Design Pattern In PHP

Observer design pattern in PHP to notify all the objects to update themselves when an object state gets changed.

Output

Inside ConcreteObserverA::Update()
State = 1
Inside ConcreteObserverB::Update()
State = 1


Suresh Kumar Srivastava is founder of online learning site coursegalaxy.com and author of popular books "C In Depth", "Data Structures Through C In Depth". He has 18+ years experience in industry and worked on architecture and design of multiple products. This article is from his courses on Design Patterns.