What is the exact difference between PHP static class and singleton class?

A static function is a function that can be called without creating an object of a class registry::doSomething() A Singleton is a design pattern that should prevent the users of the class from creating more than one instance of a class. So, there is usually only one instance of a singleton class. A Singleton's constructor should be declared private and have a static method providing a single instance-object: class Singleton { private Singleton() { } private static var $instance = null; public static getInstance() { if(self::$instance == null) self::$instance = new Singleton(); return self::$instance; } } For more information see en.wikipedia.org/wiki/Singleton_pattern P.

S: Sorry for my bad PHP, the syntax may not be 100% correct, but you should roughly understand what I mean in terms of OOP.

A static function is a function that can be called without creating an object of a class. Registry::doSomething() A Singleton is a design pattern, that should prevent the users of the class from creating more than one instance of a class. So, there is usually only one instance of a singleton class.

A Singleton's constructor should be declared private and have a static method providing a single instance-object: class Singleton { private Singleton() { } private static var $instance = null; public static getInstance() { if(self::$instance == null) self::$instance = new Singleton(); return self::$instance; } } For more information see en.wikipedia.org/wiki/Singleton_pattern P. S: Sorry for my bad PHP, the syntax may not be 100% correct, but you should roughly understand what I mean in terms of OOP.

The fact that the Singleton is a design-pattern that restricts instantiation of a class to one single object, it is possible to do some stuff that is slightly more difficult with a static class: Lazy initialization Replace implementation internally by sub-classing the Factory Manage via configuration However, there are several drawbacks to singletons, so it is better in general to use patterns such as Factory as you get additional benefits such as decoupling.

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