How to create final classes and methods

How to prevent a method from being overridden

A class with a final method

class Person {
  // Other properties and methods not shown here 
  
  final public function getFirstName() {
    return $this->firstName; 
  } 
}

A subclass that attempts to override a final method leading to a fatal error

class Employee extends Person {
  // Other properties and methods not shown here

  // This method attempts to override a final method - fatal error 
  public function getFirstName() {
    return ucwords($this->firstName); 
  } 
}

How to prevent a class from being inherited

A final class

final class Employee extends Person {
  // Properties and methods for class 
}

A class that attempts to inherit a final class leading to a fatal error

class PartTime extends Employee {
  // Properties and methods for class 
}

    Description
      A final method cannot be overridden by a method in a subclass. As a result, all subclasses must use the final version of the method.
A final class cannot be inherited by a subclass.

    

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