Final of PHP

Classes and methods with final decoration
Final class cannot be inherited
Cannot override the final method when the class being inherited



Final class
is to define a class and pre-set it, and this class does not allow other classes to "inherit" it.
That is, it sets itself as the "last Ring" in the inheritance chain of the class--no offspring!

Final approach
is to define a method and pre-set it, then a method that does not allow the subordinate class to "overwrite" it.
That is, it works on the goals that it has done, and that it is "perfect" without any other changes or improvements .

Final of PHP