abstract-function

How to declare abstract method in non-abstract class in PHP?

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See the chapter on Class Abstraction in the PHP manual: PHP 5 introduces abstract classes and methods. Classes defined as abstract may not be instantiated, and any class that contains at least one abstract method must also be abstract. Methods defined as abstract simply declare the method’s signature – they cannot define the implementation. It … Read more

Difference between virtual and abstract methods [duplicate]

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Virtual methods have an implementation and provide the derived classes with the option of overriding it. Abstract methods do not provide an implementation and force the derived classes to override the method. So, abstract methods have no actual code in them, and (non-abstract) subclasses HAVE TO override the method. Virtual methods can have code, which … Read more

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