Is it considered good practice to modify the functionality of methods within a class in PHP?

It is generally not considered good practice to modify the functionality of methods within a class in PHP as it can lead to confusion and make the code harder to maintain. Instead, it is recommended to extend the class and override the method in the child class to add or modify functionality.

class ParentClass {
    public function method() {
        // Original functionality
    }
}

class ChildClass extends ParentClass {
    public function method() {
        // New or modified functionality
        parent::method(); // Call the parent method if needed
    }
}