Best practice on PHP singleton classes [duplicate]

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An example singleton classes in php:
Creating the Singleton design pattern in PHP5 : Ans 1 :
Creating the Singleton design pattern in PHP5 : Ans 2 :

Singleton is considered "bad practice".

Mainly because of this: How is testing the registry pattern or singleton hard in PHP?

Wanna read more? :

A Singleton decision diagram (source):

Singleton Decision Diagram

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