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When and why should I use public, private, and protected functions and variables inside a class? What is the difference between them?

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  • Public scope to make that property/method available from anywhere, other classes and instances of the object.
  • Private scope when you want your property/method to be visible in its own class only.
  • Protected scope when you want to make your property/method visible in all classes that extend current class including the parent class.

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