PHP8: Encapsulation and Abstraction

What are the four principles of object-oriented programming mentioned in the text?

• Encapsulation, Inheritance, Functions, Variables

• Encapsulation, Abstraction, Inheritance, Polymorphism

• Abstraction, Polymorphism, Classes, Objects

• Encapsulation, Data Types, Inheritance, Functions

What does encapsulation do in object-oriented programming?

• Hides all methods from the user

• Allows direct access to all properties

• Bundles data and methods within one unit

• Increases the complexity of the code

Which visibility access modifier means that a property can only be accessed from within the class?

• Public

• Private

• Protected

• Static

What is a potential issue with setting a property to public?

• It makes the property read-only

• It can break encapsulation

• It allows for method chaining

• It hides the property from other classes

What is a getter method used for?

• To retrieve the value of a property

• To change the value of a property

• To create a new property

• To delete a property

What is the main concern with using getters and setters?

• They are not compatible with private properties

• They can break encapsulation

• They are always necessary

• They slow down the program

What does abstraction in object-oriented programming refer to?

• Creating multiple classes

• Making all properties public

• Hiding internal implementation details

• Using only private methods

What is the purpose of the process method in the transaction class?

• To print processing amount transactions

• To create new transaction objects

• To change the amount property

• To access private properties

How can private properties be accessed in PHP?

• By creating subclasses

• Using reflection API

• By changing them to public

• By using static methods

What is a common practice when designing classes?

• Use only private methods

• Make all properties public

• Create multiple constructors

• Avoid exposing internal methods