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PHP Final Classes and Methods
Use of PHP final
Like other programming languages like Java, the final keyword is added to PHP as of its version 5. This keyword is used as a modifier, but is applicable only to PHP classes and functions.
If the last modification is implemented in PHP classes, then, the class cannot be inherited by some other class. At the same time, if this keyword is applied for function declaration, then, this function cannot be overridden.
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.
final Usage: PHP Vs Other Languages
Like PHP in Java, it uses the last keyword to not restrict the class and at the same time it restricts Java methods to not be overridden. But apart from this, Java uses the last to define constants. Since, PHP provides constants in the class and constable keywords for the define () method for this purpose, the last is used only to derive two prior restrictions.
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.
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