Inheritance allows for enormous flexibility within a class hierarchy. You can create sub-classes to extend the functionality of a base class, but PHP OOP gives the possibility to create classes that cannot be extended. Such a class is called final class.
A final class is declared by adding the final keyword before the class word.
A normal method (public or protected) can be overridden in the child class. If you want a method to remain fixed and unchanging, prefix the definition with the final keyword.
A final method cannot be overridden.
Use of Final Keyword:
- The Final keyword prevents child classes from overriding and method.
- It means we define a method with final then it prevents us to over ride the method.