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_admin_bar_bump_cb() – Default admin bar callback.

_custom_background_cb() – Default custom background callback.

_custom_header_background_just_in_time() – Registers the internal custom header and background routines.

_find_post_by_old_date() – Find the post ID for redirecting an old date.

_find_post_by_old_slug() – Find the post ID for redirecting an old slug.

_get_admin_bar_pref() – Retrieve the admin bar display preference of a user.

_get_widget_id_base() – Retrieves the widget ID base value.

_http_build_query() – From php.net (modified by Mark Jaquith to behave like the native PHP5 function).

_insert_into_post_button() – This was once used to display an ‘Insert into Post’ button.

_links_add_base() – Callback to add a base url to relative links in passed content.

_media_button() – This was once used to display a media button.

_register_core_block_patterns_and_categories() – Registers the core block patterns and categories.

_split_str_by_whitespace() – Breaks a string into chunks by splitting at whitespace characters.

_update_blog_date_on_post_delete() – Handler for updating the current site’s last updated date when a published post is deleted.

_update_blog_date_on_post_publish() – Handler for updating the site’s last updated date when a post is published or an already published post is changed.

_usort_by_first_member() – Sorts a multidimensional array by first member of each top level member

_usort_terms_by_ID() – Sort categories by ID.

_usort_terms_by_name() – Sort categories by name.

_walk_bookmarks() – The formatted output of a list of bookmarks.

_wp_admin_bar_init() – Instantiate the admin bar object and set it up as a global for access elsewhere.

_wp_admin_html_begin() –

_wp_batch_split_terms() – Splits a batch of shared taxonomy terms.

_wp_batch_update_comment_type() – Updates the comment type for a batch of comments.

_wp_credits_build_object_link() – Retrieve the link to an external library used in WordPress.

_WP_Editors::get_baseurl() –

_wp_filter_build_unique_id() – Build Unique ID for storage and retrieval.

_wp_filter_taxonomy_base() – Filters the URL base for taxonomies.

activate_blog – action

activity_box_end – action

add_admin_bar_menus – action

add_blog_metadata – filter

add_blog_option() – Add a new option for a given blog id.

add_custom_background() – Add callbacks for background image display.

add_existing_user_to_blog() – Add a user to a blog based on details from maybe_add_existing_user_to_blog().

add_meta_box() – Adds a meta box to one or more screens.

add_meta_boxes – action

add_meta_boxes_$post_type – action

add_meta_boxes_$this – action

add_meta_boxes_comment – action

add_meta_boxes_link – action

add_new_user_to_blog() – Adds a newly created user to the appropriate blog

add_user_to_blog – action

add_user_to_blog() – Adds a user to a blog, along with specifying the user’s role.

added_blog_meta – action

admin_bar_init – action

admin_bar_menu – action

admin_body_class – filter

allowed_block_types – filter

archive_blog – action

attachment_id3_data_meta_box() – Display fields for ID3 data

attachment_submit_meta_box() – Display attachment submit form fields.

auth_cookie_bad_hash – action

auth_cookie_bad_session_token – action

auth_cookie_bad_username – action

avoid_blog_page_permalink_collision() – Avoids a collision between a site slug and a permalink slug.

background_color() – Display background color value.

background_image() – Display background image path.

backslashit() – Adds backslashes before letters and before a number at the start of a string.

balanceTags() – Balances tags if forced to, or if the ‘use_balanceTags’ option is set to true.

before_delete_post – action

before_last_bar() – Remove last item on a pipe-delimited string.

before_signup_form – action

before_signup_header – action

before_wp_tiny_mce – action

begin_fetch_post_thumbnail_html – action

big_image_size_threshold – filter

bin2hex() –

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block_categories – filter

block_core_latest_posts_get_excerpt_length() – Callback for the excerpt_length filter used by the Latest Posts block at render time.

block_core_latest_posts_migrate_categories() – Handles outdated versions of the `core/latest-posts` block by converting attribute `categories` from a numeric string to an array with key `id`.

block_core_social_link_get_color_styles() – Returns CSS styles for icon and icon background colors.

block_core_social_link_get_icon() – Returns the SVG for social link.

block_core_social_link_get_name() – Returns the brand name for social link.

block_core_social_link_services() – Returns the SVG for social link.

block_default_classname – filter

block_editor_meta_box_hidden_fields – action

block_editor_no_javascript_message – filter

block_editor_preload_paths – filter

block_editor_settings – filter

block_local_requests – filter

block_parser_class – filter

block_type_metadata – filter

block_type_metadata_settings – filter

block_version() – Returns the current version of the block format that the content string is using.

blog_option_$option – filter

blog_privacy_selector – action

blog_redirect_404 – filter

bloginfo – filter

bloginfo_rss – filter

bloginfo_rss() – Display RSS container for the bloginfo function.

bloginfo_url – filter

bloginfo() – Displays information about the current site.

body_class – filter

body_class() – Displays the class names for the body element.

bool_from_yn() – Whether input is yes or no.

browse-happy-notice – filter

build_dropdown_script_block_core_categories() – Generates the inline script for a categories dropdown field.

build_query() – Build URL query based on an associative and, or indexed array.

bulk_actions-$this – filter

bulk_edit_custom_box – action

bulk_edit_posts() – Process the post data for the bulk editing of posts.