Is it possible to define a interface Singleton in PHP?

I thought on this approach, but it has some cons.. 1. PHP 5.3 is needed 2. You class acts as a SingletonContainer 3.

Derived classes are considered different 4. You are calling the constructor But it has the advantage that you just need to extend that class to have a Singleton – Eridal Aug 19 '10 at 13:59.

Remember PHP doesn't allow multiple inheritance so you must carefully choose what you base your classes on. Singleton is so easy to implement it's probably better to let each class define it. Beware also that private fields are not ported to descendant classes and therefore you can have two different fields with the same name.

First of all: if you have so much Singletons over the project then you probably mess up something on projection level Second of all: Singleton should be used there, and only there, where more that one instance of a class makes totally no sense or might cause some errors Finally: the inheritance ain't designed to reduce the amount of code.

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