PHP Final Classes and Methods- Tutorialpath

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PHP Final Classes and Methods

PHP Final Classes and Methods
PHP Final Class

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.

Final classes

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.

Example:

final class Example
final class Example

Output:

final class output
final class output

 

Final methods

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.

Example:

final method Example
final method Example

Output:

final method output
final method output

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.

Conclusion:

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