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A WordPress debug log records diagnostic output when the relevant debugging constants and logging configuration are enabled.
A drop-in is a specially named WordPress file that replaces or extends a specific low-level component, such as object caching.
A filter hook lets callbacks transform a value as it passes through WordPress or a plugin.
Multisite runs several WordPress sites within one installation using network-level administration and site-specific content and settings.
A must-use plugin is loaded automatically from the mu-plugins directory and is managed differently from an ordinary activated plugin.
A WordPress nonce is a time-limited token used to help verify that a request originated from the expected site context.
The Options API reads and writes site-level settings through functions such as get_option() and update_option().
A WordPress plugin is an installable package that extends the site's behavior through PHP, hooks, assets, and other supported interfaces.
Post metadata stores key-value information associated with an individual WordPress post, page, attachment, or custom post record.
Post status describes a content record's publication state, such as draft, published, scheduled, private, or trashed.
The WordPress REST API exposes site resources through HTTP endpoints and JSON responses.
A rewrite rule maps a frontend URL pattern to query variables that WordPress uses to resolve the requested content.
The Settings API supplies a framework for registering settings, sections, fields, and administrative form processing.
A WordPress taxonomy groups content using terms.
The template hierarchy determines which theme template WordPress uses for a particular request.
A WordPress theme controls the site's frontend presentation through templates, styles, and related features.
A transient stores temporary cached data with an expiration limit through WordPress's transient API.
Trash is a temporary post status used to retain deleted content for possible restoration until it is emptied or permanently removed.
An uninstall hook runs the plugin's registered cleanup routine when WordPress uninstalls that plugin.
The World Wide Web—commonly referred to as WWW, W3, or the Web—is a system of interconnected public webpages accessible through the Internet.
WP-CLI is a command-line interface for managing WordPress through supported commands.
WP-Cron is WordPress’s task-scheduling system for running callbacks at scheduled times.
WP Social Ninja is a WordPress product for integrating supported social content, reviews, and related website widgets.
wp_add_inline_script(): Adds extra code to a registered script.
wp_add_inline_style(): Adds extra CSS styles to a registered stylesheet.
wp_add_object_terms(): Adds term(s) associated with a given object.
wp_allowed_protocols(): Retrieves a list of protocols to allow in HTML attributes.
wp_allow_comment(): Validates whether this comment is allowed to be made.
wp_audio_shortcode(): Builds the Audio shortcode output.
wp_authenticate_application_password(): Authenticates the user using an application password.
wp_authenticate_cookie(): Authenticates the user using the WordPress auth cookie.
wp_authenticate_spam_check(): For Multisite blogs, checks if the authenticated user has been marked as a spammer, or if the user's primary blog has been marked as spam.
wp_auth_check(): Checks whether a user is still logged in, for the heartbeat.
wp_cache_add(): Adds data to the cache, if the cache key doesn't already exist.
wp_cache_add_multiple(): Adds multiple values to the cache in one call.
wp_cache_close(): Closes the cache.
wp_cache_decr(): Decrements numeric cache item's value.
wp_cache_delete_multiple(): Deletes multiple values from the cache in one call.
wp_cache_flush_group(): Removes all cache items in a group, if the object cache implementation supports it.
wp_cache_get(): Retrieves the cache contents from the cache by key and group.
wp_cache_get_multiple(): Retrieves multiple values from the cache in one call.
wp_cache_incr(): Increments numeric cache item's value.
wp_cache_replace(): Replaces the contents of the cache with new data.
wp_cache_set(): Saves the data to the cache.
wp_cache_set_multiple(): Sets multiple values to the cache in one call.
wp_calculate_image_sizes(): Creates a 'sizes' attribute value for an image.
wp_calculate_image_srcset(): A helper function to calculate the image sources to include in a 'srcset' attribute.
wp_check_comment_disallowed_list(): Checks if a comment contains disallowed characters or words.
wp_check_comment_flood(): Checks whether comment flooding is occurring.
wp_check_filetype(): Retrieves the file type from the file name.