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How To Source Code A Singleton Design Pattern In PHP 5. Asymp; Leave a comment. Singleton Design Pattern is a Creational Pattern. Goal Of The Singleton Pattern. Ensure a class has only one instance and provide a global point to retrieve it. The singleton is used to create only one single point of entry or functionality within a system or application. The purpose of the singleton pattern is to have just one single instance of an object in the entire application.