Most called by core

Retrieves the full permalink for the current post or post ID.

Updates the value of an option that was already added.

Checks and cleans a URL.

Retrieves an option value based on an option name.

Retrieves a modified URL query string.

Retrieves information about the current site.

Gets all term data from database by term ID.

Kills WordPress execution and displays HTML page with an error message.

Marks something as being incorrectly called.

Retrieves the value of a site transient.

Calls the callback functions that have been added to an action hook.

Verifies the Ajax request to prevent processing requests external of the blog.

Enqueues a script.

Retrieves post data given a post ID or post object.

Retrieves comment data given a comment ID or comment object.

Calls the callback functions that have been added to a filter hook.

Marks a function as deprecated and inform when it has been used.

Marks a function argument as deprecated and inform when it has been used.

Creates a cryptographic token tied to a specific action, user, user session, and window of time.

Checks a theme's support for a given feature.

Enqueues a CSS stylesheet.

Retrieves theme modification value for the active theme.

Gets a WP_Theme object for a theme.

Converts float number to format based on the locale.

Sends a JSON response back to an Ajax request, indicating failure.

Encodes a variable into JSON, with some confidence checks.

Sanitizes a string into a slug, which can be used in URLs or HTML attributes.

Ensures a REST response is a response object (for consistency).

Retrieves template directory URI for the active theme.

Gets the theme support arguments passed when registering that support.

Removes a callback function from a filter hook.

Adds a callback function to a filter hook.

Merges user defined arguments into defaults array.

Retrieves URL with nonce added to URL query.

Sanitizes a string key.

Gets a list of all registered post type objects.

Escaping for HTML blocks.

Escaping for HTML attributes.

i18n-friendly version of basename().

Sends a JSON response back to an Ajax request, indicating success.

Determines whether the query is for an existing single post of any post type (post, attachment, page, custom post types).

Retrieves the cache contents from the cache by key and group.

Sanitizes a string from user input or from the database.

Gets the current user's ID.

Returns whether the current user has the specified capability.

Adds a callback function to an action hook.

Retrieves a post meta field for the given post ID.

Adds slashes to a string or recursively adds slashes to strings within an array.

Determines whether Multisite is enabled.

Retrieve an option value for the current network based on name of option.

Retrieves translated string with gettext context.

Sanitizes a URL for database or redirect usage.

Retrieves the URL to a REST endpoint.

Checks whether the given variable is a WordPress Error.

Retrieves the URL for the current site where the front end is accessible.

Retrieves the taxonomy object of $taxonomy.

Retrieves a post type object by name.

Retrieves the post type of the current post or of a given post.

Retrieves the URL to the admin area for the current site.

Displays translated text.

Polyfill for `str_starts_with()` function added in PHP 8.0.

Polyfill for `str_contains()` function added in PHP 8.0.

Retrieves the translation of $text.

Appends a trailing slash.

Determines whether the current visitor is a logged in user.

Determines whether the current request is for an administrative interface page.

Retrieves user info by user ID.

Retrieves the number of times an action has been fired during the current request.

Converts a value to non-negative integer.

Removes slashes from a string or recursively removes slashes from strings within an array.

Retrieves the current site ID.

Generates a string of attributes by applying to the current block being rendered all of the features that the block supports.

Returns a contextual HTTP error code for authorization failure.

Registers a block type from the metadata stored in the `block.json` file.

Retrieves the post title.

Checks or sets whether WordPress is in "installation" mode.

Polyfill for `str_ends_with()` function added in PHP 8.0.

Retrieves the value of a query variable in the WP_Query class.

Removes trailing forward slashes and backslashes if they exist.

Generates a user-level error/warning/notice/deprecation message.

Translates and retrieves the singular or plural form based on the supplied number.

Retrieves name of the current stylesheet.

Sets the scheme for a URL.

Plucks a certain field out of each object or array in an array.

Displays translated text that has been escaped for safe use in an attribute.

Checks a post type's support for a given feature.

Outputs an admin notice.

Retrieves user info by a given field.

Retrieves the URL for an attachment.

Registers a REST API route.

Retrieves attachment metadata for attachment ID.

Echoes a submit button, with provided text and appropriate class(es).

Retrieves the requested data of the author of the current post.

Retrieves or display nonce hidden field for forms.

Saves the data to the cache.

Updates a post meta field based on the given post ID.

Retrieves the current user object.

Determines whether the post requires password and whether a correct password has been provided.

Retrieves the URL to the admin area for either the current site or the network depending on context.