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__get_option() – Utility version of get_option that is private to installation/upgrade.

_clear_modified_cache_on_transition_comment_status() – Clear the lastcommentmodified cached value when a comment status is changed.

_close_comments_for_old_post() – Close comments on an old post. Hooked to comments_open and pings_open.

_close_comments_for_old_posts() – Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.

_delete_option_fresh_site() – Delete the fresh site option.

_draft_or_post_title() – Get the post title.

_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_custom_object_labels() – Build an object with custom-something object (post type, taxonomy) labels out of a custom-something object

_oembed_create_xml() – Creates an XML string from a given array.

_oembed_filter_feed_content() – Prepare the oembed HTML to be displayed in an RSS feed.

_oembed_rest_pre_serve_request() – Hooks into the REST API output to print XML instead of JSON.

_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.

_update_posts_count_on_delete() – Handler for updating the current site’s posts count when a post is deleted.

_update_posts_count_on_transition_post_status() – Handler for updating the current site’s posts count when a post status changes.

_update_term_count_on_transition_post_status() – Update the custom taxonomies’ term counts when a post’s status is changed.

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

_wp_delete_orphaned_draft_menu_items() – Deletes orphaned draft menu items

_wp_http_get_object() – Returns the initialized WP_Http Object

_wp_menu_output() – Display menu.

_wp_object_count_sort_cb() – Serves as a callback for comparing objects based on count.

_wp_object_name_sort_cb() – Serves as a callback for comparing objects based on name.

_wp_oembed_get_object() – Returns the initialized WP_oEmbed object.

_wp_upgrade_revisions_of_post() – Upgrade the revisions author, add the current post as a revision and set the revisions version to 1

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

add_network_option() – Add a new network option.

add_object_page() – Add a top-level menu page in the ‘objects’ section.

add_option – action

add_option_$option – action

add_option_new_admin_email – action

add_option_update_handler() – Register a setting and its sanitization callback

add_option_whitelist() – Adds an array of options to the options whitelist.

add_option() – Add a new option.

add_options_page() – Add submenu page to the Settings main menu.

add_screen_option() – Register and configure an admin screen option

add_site_option – action

add_site_option_$option – action

add_site_option_new_admin_email – action

add_site_option() – Add a new option for the current network.

added_option – action

addslashes_strings_only() – Adds slashes only if the provided value is a string.

allowed_http_origin – filter

allowed_http_origins – filter

blog_option_$option – filter

Bulk_Upgrader_Skin::flush_output() –

cat_is_ancestor_of() – Check if a category is an ancestor of another category.

clean_object_term_cache – action

clean_object_term_cache() – Removes the taxonomy relationship to terms from the cache.

comment_feed_orderby – filter

comment_on_draft – action

comment_on_password_protected – action

comment_on_trash – action

comments_open – filter

comments_open() – Determines whether the current post is open for comments.

crypto_box_open() –

crypto_box_seal_open() –

crypto_secretbox_open() –

crypto_sign_open() –

custom_header_options – action

custom_menu_order – filter

customize_value_old_sidebars_widgets_data – filter

default_option_$id_base – filter

default_option_$option – filter

default_option_$option_name – filter

default_option_link_manager_enabled – filter

default_option_nav_menu_options – filter

default_site_option_$option – filter

default_site_option_ms_files_rewriting – filter

delete_blog_option() – Removes option by name for a given blog id. Prevents removal of protected WordPress options.

delete_network_option() – Removes a network option by name.

delete_option – action

delete_option_$option – action

delete_option() – Removes option by name. Prevents removal of protected WordPress options.

delete_site_option – action

delete_site_option_$option – action

delete_site_option() – Removes a option by name for the current network.

delete_user_option() – Delete user option with global blog capability.

deleted_option – action

embed_cache_oembed_types – filter

embed_oembed_discover – filter

embed_oembed_html – filter

exit_on_http_head – filter

expiration_of_site_transient_$transient – filter

expiration_of_transient_$transient – filter

export_date_options() – Create the date options fields for exporting a given post type.

filter_default_option() – Filter the default value for the option.

force_filtered_html_on_import – filter

form_option() – Print option value after sanitizing for forms.

get_allowed_http_origins() – Retrieve list of allowed HTTP origins.

get_blog_option() – Retrieve option value for a given blog id based on name of option.

get_blogs_of_user – filter

get_blogs_of_user() – Get the sites a user belongs to.

get_http_origin() – Get the HTTP Origin of the current request.

get_most_recent_post_of_user() – Get a user’s most recent post.

get_network_option() – Retrieve a network’s option value based on the option name.

get_object_subtype_$object_type – filter

get_object_subtype() – Returns the object subtype for a given object ID of a specific type.

get_object_taxonomies() – Return the names or objects of the taxonomies which are registered for the requested object or object type, such as a post object or post type name.

get_object_term_cache() – Retrieves the cached term objects for the given object ID.

get_object_terms – filter

get_objects_in_term() – Retrieve object_ids of valid taxonomy and term.