The WordPress Trivia Quiz

rest_prepare_{post_type}

wp_rest_api_response

rest_api_modify_response

wp_api_custom_filter

It allows adding a new custom field to an existing REST API endpoint.

It registers a new custom post type with REST support.

It validates REST API requests before execution.

It enables authentication for REST API endpoints.

Cookie authentication

Application passwords

OAuth 2.0

Basic authentication

wp_links

wp_blogs

wp_users

wp_options

wp_posts

wp_posts_1

wp_1_posts

wp_2_posts

switch_blog()

switch_to_blog()

switch_multisite_instance()

change_wp_site()

The site crashes.

The global $wpdb object remains set to the wrong site's blog id.

All subsequent queries return null.

The WordPress admin bar disappears for super admins.

@wordpress/create-block

@wordpress/blocks

@wordpress/editor

@wordpress/data

add_action('enqueue_block_assets', ...)

const bp = useBlockProps( { style: {...s} ); return (<p { ...bp }>Hi!</p>);

register_block_style(...);

Using CSS classes/external rules because custom blocks get CSS classnames

Using `register_block_type()` with the `supports` key

Adding `allowedPostTypes` in the block’s JavaScript metadata

Filtering `allowed_block_types_all` to define allowed blocks per post type

Setting `postTypeRestriction` in block.json

It disables transient caching for a single query execution.

It temporarily prevents WordPress from writing to the WP_Object_Cache.

It enables cache flushing during plugin activation.

It suspends query caching in the MySQL database.

Transients API

WP_Object_Cache

wp_options

Redis/Memcached Object Cache

Call update_post_meta() in a loop

Use wp_update_post() with a meta array

Call $wpdb->update(); - passing table name, columns/new values, and WHERE

Call $wpdb->query(); with arbitrary SQL UPDATE statement

login_redirect

wp_login_url

redirect_after_login

wp_auth_redirect

It triggers just before the WordPress database closes the connection.

It executes after the page is fully rendered, just before the script ends.

It is a deprecated function used in old caching systems.

It runs before the footer is loaded on a page.

wp user meta update password

wp user generate-passwords

wp user reset-password $(wp user list --format=ids)

wp user update --user_pass=random

Transients

WP_Object_Cache

User Session Cookies

Redis/Memcached