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1. 1. What is a WordPress hook?

   What is a WordPress hook?

   A named extension point where callbacks can run A theme screenshot A database table A user session
   Hint

   Identify the role of the WordPress function or extension point.

2. 2. What are the two main kinds of WordPress hooks?

   What are the two main kinds of WordPress hooks?

   Posts and pages Themes and plugins Actions and filters GET and POST
   Hint

   Identify the role of the WordPress function or extension point.

3. 3. What is an action used for?

   What is an action used for?

   Returning a transformed value as its main contract Defining a database key Running behavior at a particular event or lifecycle point Creating a CSS selector
   Hint

   Identify the role of the WordPress function or extension point.

4. 4. What is a filter used for?

   What is a filter used for?

   Uploading media Stopping all WordPress execution Receiving a value, modifying it and returning it Creating a user role automatically
   Hint

   Identify the role of the WordPress function or extension point.

5. 5. What is a hook callback?

   What is a hook callback?

   A database response The hook name itself A callable function or method registered to run on a hook An HTML comment
   Hint

   Identify the role of the WordPress function or extension point.

6. 6. Which function registers a callback on an action?

   Which function registers a callback on an action?

   apply_filters() do_action() add_action() register_action_file()
   Hint

   Identify the role of the WordPress function or extension point.

7. 7. What does do_action() do?

   What does do_action() do?

   Removes every action Fires an action and invokes registered callbacks Returns a filtered string Registers a new callback
   Hint

   Identify the role of the WordPress function or extension point.

8. 8. Which function registers a callback on a filter?

   Which function registers a callback on a filter?

   apply_filters() do_action() filter_value_now() add_filter()
   Hint

   Identify the role of the WordPress function or extension point.

9. 9. What does apply_filters() do?

   What does apply_filters() do?

   Passes a value through registered filter callbacks and returns the result Registers a filter only Creates a WordPress option Prints the value automatically
   Hint

   Identify the role of the WordPress function or extension point.

10. 10. What must a filter callback normally do?

    What must a filter callback normally do?

    Return the value that should continue through the filter chain Call exit Echo the value and return nothing Delete the original value
    Hint

    Identify the role of the WordPress function or extension point.

11. 11. How does WordPress connect a registered callback to a fired hook?

    How does WordPress connect a registered callback to a fired hook?

    The callbacks share a variable The database assigns an ID The hook name strings match The files have the same filename
    Hint

    Identify the role of the WordPress function or extension point.

12. 12. What is the default hook priority when none is specified?

    What is the default hook priority when none is specified?

    0 100 1 10
    Hint

    Identify the role of the WordPress function or extension point.

13. 13. Which callback runs first on the same hook?

    Which callback runs first on the same hook?

    The callback in the largest file The callback with the lower numeric priority The callback with the longest name The newest plugin always
    Hint

    Identify the role of the WordPress function or extension point.

14. 14. How are callbacks with the same priority generally ordered?

    How are callbacks with the same priority generally ordered?

    By the order in which they were registered Randomly Alphabetically By plugin folder size
    Hint

    Identify the role of the WordPress function or extension point.

15. 15. Why specify accepted arguments when registering a callback?

    Why specify accepted arguments when registering a callback?

    To assign user permissions To define SQL placeholders To tell WordPress how many hook arguments the callback wants To control the number of executions
    Hint

    Identify the role of the WordPress function or extension point.

16. 16. Why can an inline anonymous hook callback be difficult to remove later?

    Why can an inline anonymous hook callback be difficult to remove later?

    WordPress converts it to HTML Removal requires the same callback identity and priority It has no priority Anonymous functions cannot run
    Hint

    Identify the role of the WordPress function or extension point.

17. 17. Where should functionality that must survive a theme change usually be hooked?

    Where should functionality that must survive a theme change usually be hooked?

    In a WordPress core file In a plugin Only in the theme footer In uploaded media
    Hint

    Identify the role of the WordPress function or extension point.

18. 18. Which hook is designed for registering theme features?

    Which hook is designed for registering theme features?

    shutdown wp_ajax after_setup_theme plugins_loaded
    Hint

    Identify the role of the WordPress function or extension point.

19. 19. What is init commonly used for?

    What is init commonly used for?

    Connecting to DNS Registering content structures and general functionality after WordPress has loaded Saving every post Printing the closing HTML tag
    Hint

    Identify the role of the WordPress function or extension point.

20. 20. Why should a developer inspect hook documentation before registering a callback?

    Why should a developer inspect hook documentation before registering a callback?

    To avoid naming the callback To disable all priorities To discover the database password To understand timing, arguments and expected return behavior
    Hint

    Identify the role of the WordPress function or extension point.