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1. 1. What is a PHP class?

   What is a PHP class?

   A blueprint that defines data and behavior for objects An HTTP method A database row A CSS selector
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

2. 2. What is an object?

   What is an object?

   A PHP source comment A SQL database A WordPress URL An instance of a class
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

3. 3. Which keyword creates an object from a class?

   Which keyword creates an object from a class?

   new object make instance
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

4. 4. What is a property?

   What is a property?

   A PHP file include A value stored on a class or object A function argument only An HTTP header
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

5. 5. What is a method?

   What is a method?

   A DNS record A function declared inside a class A database column A standalone HTML tag
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

6. 6. What does $this refer to inside a non-static method?

   What does $this refer to inside a non-static method?

   The global namespace The parent class only The current object instance The current PHP file
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

7. 7. When is __construct() normally called?

   When is __construct() normally called?

   When the object is printed Only when PHP shuts down When a new object is instantiated After every method call
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

8. 8. What does public visibility mean?

   What does public visibility mean?

   The member is always static The member is stored on the internet The member can be accessed from outside the class The member cannot be inherited
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

9. 9. What does private visibility mean?

   What does private visibility mean?

   The member is available to every subclass The member cannot store values The member is accessible only inside the class that declares it The member is encrypted
   Hint

   Focus on the responsibility of the language feature rather than memorizing punctuation.

10. 10. Who can access a protected member?

    Who can access a protected member?

    Every caller Only unrelated functions Only the web server The declaring class and its subclasses
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

11. 11. What is encapsulation?

    What is encapsulation?

    Removing every property Encoding an object as HTML Keeping state and behavior together while controlling access to implementation details Putting all code in one global function
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

12. 12. What does class Child extends Parent express?

    What does class Child extends Parent express?

    Both classes become functions Parent is deleted Child includes a PHP file named Parent Child inherits accessible behavior and state from Parent
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

13. 13. What does an interface primarily define?

    What does an interface primarily define?

    Stored object values A contract of methods implementing classes must provide A database schema A rendered admin screen
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

14. 14. Which keyword declares that a class follows an interface?

    Which keyword declares that a class follows an interface?

    extends requires uses implements
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

15. 15. Why declare a class abstract?

    Why declare a class abstract?

    It removes type checking It provides a partial base that cannot be instantiated directly It prevents all inheritance It makes every method private
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

16. 16. What is a PHP trait used for?

    What is a PHP trait used for?

    Reusing a set of methods in multiple unrelated classes Defining an HTTP route Creating a database table Replacing every interface
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

17. 17. What is a static method associated with?

    What is a static method associated with?

    A WordPress post The class rather than a particular object instance Only the current browser session A database row
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

18. 18. What does final prevent when applied to a method?

    What does final prevent when applied to a method?

    The class being loaded Subclasses overriding that method The method returning a value The method using parameters
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

19. 19. What is constructor dependency injection?

    What is constructor dependency injection?

    Copying global variables into a class Loading CSS through PHP Creating every dependency inside each method Providing required collaborator objects through the constructor
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.

20. 20. What does composition favor?

    What does composition favor?

    Making every method static Building behavior by collaborating objects rather than deep inheritance Putting all classes in one file Using only global functions
    Hint

    Focus on the responsibility of the language feature rather than memorizing punctuation.