Plugins from Zero

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1. What is the purpose of a WordPress plugin?

What is the purpose of a WordPress plugin? Replace the database Control the web-server operating system Provide only CSS colors Add or modify functionality without editing WordPress core

Hint
Identify the WordPress API responsibility before considering implementation details.
2. Where are ordinary WordPress plugins stored by default?

Where are ordinary WordPress plugins stored by default? wp-admin/plugins wp-includes/plugins wp-content/uploads wp-content/plugins

Hint
Identify the WordPress API responsibility before considering implementation details.
3. What lets WordPress recognize a PHP file as a plugin?

What lets WordPress recognize a PHP file as a plugin? A class named WordPressPlugin A valid plugin header containing Plugin Name A CSS @plugin rule A JSON database

Hint
Identify the WordPress API responsibility before considering implementation details.
4. What is the plugin main file?

What is the plugin main file? The largest PHP file wp-config.php The active theme index.php The PHP file containing the identifying plugin header and bootstrap code

Hint
Identify the WordPress API responsibility before considering implementation details.
5. What happens when an administrator activates a plugin?

What happens when an administrator activates a plugin? WordPress marks it active and loads it on subsequent requests Its files become public posts WordPress copies it into core The database is recreated

Hint
Identify the WordPress API responsibility before considering implementation details.
6. Does deactivating a plugin normally delete its files and data?

Does deactivating a plugin normally delete its files and data? No, it stops ordinary loading but should usually preserve recoverable data It removes the database server It deletes WordPress core Yes, always

Hint
Identify the WordPress API responsibility before considering implementation details.
7. When should permanent plugin cleanup normally occur?

When should permanent plugin cleanup normally occur? On every page request On every deactivation without warning When a theme changes During an explicit uninstall routine

Hint
Identify the WordPress API responsibility before considering implementation details.
8. What is register_activation_hook() used for?

What is register_activation_hook() used for? Load the theme header Register a frontend action Create an AJAX request Register code to run when the plugin is activated

Hint
Identify the WordPress API responsibility before considering implementation details.
9. What is register_deactivation_hook() used for?

What is register_deactivation_hook() used for? Render an admin page Register code to run when the plugin is deactivated Delete every plugin option Register a post type on init

Hint
Identify the WordPress API responsibility before considering implementation details.
10. How do plugins usually integrate with WordPress behavior?

How do plugins usually integrate with WordPress behavior? By changing DNS records By replacing PHP By editing core files By registering callbacks on actions and filters

Hint
Identify the WordPress API responsibility before considering implementation details.
11. Why should plugin functions and identifiers use a unique prefix or namespace?

Why should plugin functions and identifiers use a unique prefix or namespace? To hide code from PHP To bypass authorization To avoid collisions with WordPress and other extensions To make them run twice

Hint
Identify the WordPress API responsibility before considering implementation details.
12. Why might a plugin file check whether ABSPATH is defined?

Why might a plugin file check whether ABSPATH is defined? To locate the database password To activate itself To stop direct execution outside the WordPress bootstrap To register CSS

Hint
Identify the WordPress API responsibility before considering implementation details.
13. Why use plugin path and URL helper functions rather than hard-coded installation paths?

Why use plugin path and URL helper functions rather than hard-coded installation paths? URLs are always secret WordPress installations and directories can vary Plugins run only on localhost PHP cannot read strings

Hint
Identify the WordPress API responsibility before considering implementation details.
14. How should a plugin add frontend JavaScript or CSS?

How should a plugin add frontend JavaScript or CSS? Edit the active theme Store it as a post title Enqueue it on the appropriate WordPress hook Print every asset in wp-config.php

Hint
Identify the WordPress API responsibility before considering implementation details.
15. Which action is commonly used to register plugin administration menu pages?

Which action is commonly used to register plugin administration menu pages? wp_footer template_redirect admin_menu the_content

Hint
Identify the WordPress API responsibility before considering implementation details.
16. Where should plugin configuration usually be managed?

Where should plugin configuration usually be managed? Inside public JavaScript secrets Through an authorized settings interface and WordPress APIs By asking users to edit core In post titles

Hint
Identify the WordPress API responsibility before considering implementation details.
17. What is a plugin text domain used for?

What is a plugin text domain used for? Authorizing users Registering routes Creating database tables Associating translatable strings with the plugin translation catalogue

Hint
Identify the WordPress API responsibility before considering implementation details.
18. How should a plugin handle a missing required dependency?

How should a plugin handle a missing required dependency? Delete the site options Cause a public fatal error Edit the dependency Fail safely and show an actionable administration notice

Hint
Identify the WordPress API responsibility before considering implementation details.
19. Why should plugin updates preserve backward compatibility or provide migrations?

Why should plugin updates preserve backward compatibility or provide migrations? Updates erase PHP automatically Only themes have versions WordPress never reloads plugins Existing sites already contain data and integrations created by older versions

Hint
Identify the WordPress API responsibility before considering implementation details.
20. Which feature most clearly belongs in a plugin?

Which feature most clearly belongs in a plugin? A theme template layout A presentation-only font choice A reusable custom content workflow that should survive theme changes A decorative border

Hint
Identify the WordPress API responsibility before considering implementation details.

1. What is the purpose of a WordPress plugin?

2. Where are ordinary WordPress plugins stored by default?

3. What lets WordPress recognize a PHP file as a plugin?

4. What is the plugin main file?

5. What happens when an administrator activates a plugin?

6. Does deactivating a plugin normally delete its files and data?

7. When should permanent plugin cleanup normally occur?

8. What is register_activation_hook() used for?

9. What is register_deactivation_hook() used for?

10. How do plugins usually integrate with WordPress behavior?

11. Why should plugin functions and identifiers use a unique prefix or namespace?

12. Why might a plugin file check whether ABSPATH is defined?

13. Why use plugin path and URL helper functions rather than hard-coded installation paths?

14. How should a plugin add frontend JavaScript or CSS?

15. Which action is commonly used to register plugin administration menu pages?

16. Where should plugin configuration usually be managed?

17. What is a plugin text domain used for?

18. How should a plugin handle a missing required dependency?

19. Why should plugin updates preserve backward compatibility or provide migrations?

20. Which feature most clearly belongs in a plugin?