oop - Abstract keyword in PHP -

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Hey, I'm experiencing a lot with PHP but I do not know what the essence of the keyword is when this object is centered. Programming Can anyone explain in plain English that what can be used for it?

What preconditions will I use? How does the class / interface change?

(Hopefully this is very easy - I think I can do better I ^^)

a abstract can not be instanciated: you can only create another class which is abstract class , And instciciate that child.

And if you declare some methods in the form of abstract , then they should be defined in the child class, Instanciable.


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