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__checked_selected_helper() – Private helper function for checked, selected, disabled and readonly.

_ajax_wp_die_handler() – Kills WordPress execution and displays Ajax response with an error message.

_autop_newline_preservation_helper() – Newline preservation help function for wpautop

_cleanup_header_comment() – Strip close comment and close php tags from file headers used by WP.

_config_wp_home() – Retrieve the WordPress home page URL.

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

_custom_logo_header_styles() – Adds CSS to hide header text for custom logo, based on Customizer setting.

_default_wp_die_handler() – Kills WordPress execution and displays HTML page with an error message.

_deprecated_hook() – Marks a deprecated action or filter hook as deprecated and throws a notice.

_future_post_hook() – Hook used to schedule publication for a post marked for the future.

_get_random_header_data() – Gets random header image data from registered images in theme.

_get_term_hierarchy() – Retrieves children of taxonomy as Term IDs.

_hash_hmac() – Internal compat function to mimic hash_hmac().

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

_json_wp_die_handler() – Kills WordPress execution and displays JSON response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_publish_post_hook() – Hook to schedule pings and enclosures when a post is published.

_restore_wpautop_hook() – If do_blocks() needs to remove wpautop() from the `the_content` filter, this re-adds it afterwards, for subsequent `the_content` usage.

_save_post_hook() – Callback formerly fired on the save_post hook. No longer needed.

_scalar_wp_die_handler() – Kills WordPress execution and displays an error message.

_wp_admin_html_begin() –

_wp_ajax_add_hierarchical_term() – Ajax handler for adding a hierarchical term.

_wp_call_all_hook() – Call the ‘all’ hook, which will process the functions hooked into it.

_wp_handle_upload() – Handles PHP uploads in WordPress.

_wp_http_get_object() – Returns the initialized WP_Http Object

_wp_personal_data_handle_actions() – Handle list table actions.

_wp_post_thumbnail_html() – Returns HTML for the post thumbnail meta box.

_xml_wp_die_handler() – Kills WordPress execution and displays XML response with an error message.

_xmlrpc_wp_die_handler() – Kills WordPress execution and displays XML response with an error message.

$page_hook – action

$type_template_hierarchy – filter

activate_header – action

activate_wp_head – action

add_contextual_help() – Add contextual help text for a page.

add_custom_image_header() – Add callbacks for image header display.

add_option_update_handler() – Register a setting and its sanitization callback

admin_head – action

admin_head – action

admin_head_$content_func – action

admin_head-$hook_suffix – action

admin_head-$page – action

admin_head-$page – action

admin_head-media-upload-popup – action

admin_head-nav-menus.php – action

admin_head-widgets.php – action

admin_post_thumbnail_html – filter

allowed_http_origin – filter

allowed_http_origins – filter

allowed_http_request_hosts() – Whitelists allowed redirect hosts for safe HTTP requests as well.

allowed_redirect_hosts – filter

atom_head – action

AtomParser::error_handler() –

auth_cookie_bad_hash – action

Automatic_Upgrader_Skin::header() –

before_signup_header – action

begin_fetch_post_thumbnail_html – action

block_editor_meta_box_hidden_fields – action

block_has_support() – Checks whether the current block type supports the feature requested.

browse-happy-notice – filter

Bulk_Upgrader_Skin::bulk_header() –

Bulk_Upgrader_Skin::header() –

cache_javascript_headers() – Set the headers for caching for 10 days with JavaScript content type.

comment_moderation_headers – filter

comment_notification_headers – filter

comments_atom_head – action

commentsrss2_head – action

contextual_help – filter

contextual_help_list – filter

Custom_Background::handle_upload() – Handle an Image upload for the background image.

custom_header_options – action

Custom_Image_Header

Custom_Image_Header

Custom_Image_Header::__construct() – Constructor – Register administration header callback.

Custom_Image_Header::admin_page() – Display the page based on the current step.

Custom_Image_Header::ajax_header_add() – Given an attachment ID for a header image, updates its "last used" timestamp to now.

Custom_Image_Header::ajax_header_crop() – Gets attachment uploaded by Media Manager, crops it, then saves it as a new object. Returns JSON-encoded object details.

Custom_Image_Header::ajax_header_remove() – Given an attachment ID for a header image, unsets it as a user-uploaded header image for the current theme.

Custom_Image_Header::attachment_fields_to_edit() – Unused since 3.5.0.

Custom_Image_Header::create_attachment_object() – Create an attachment ‘object’.

Custom_Image_Header::css_includes() – Set up the enqueue for the CSS files

Custom_Image_Header::customize_set_last_used() – Updates the last-used postmeta on a header image attachment after saving a new header image via the Customizer.

Custom_Image_Header::filter_upload_tabs() – Unused since 3.5.0.

Custom_Image_Header::finished() – Display last step of custom header image page.

Custom_Image_Header::get_default_header_images() – Gets the details of default header images if defined.

Custom_Image_Header::get_header_dimensions() – Calculate width and height based on what the currently selected theme supports.

Custom_Image_Header::get_previous_crop() – Get the ID of a previous crop from the same base image.

Custom_Image_Header::get_uploaded_header_images() – Gets the previously uploaded header images.

Custom_Image_Header::help() – Adds contextual help.

Custom_Image_Header::init() – Set up the hooks for the Custom Header admin page.

Custom_Image_Header::insert_attachment() – Insert an attachment and its metadata.

Custom_Image_Header::js_1() – Display JavaScript based on Step 1 and 3.

Custom_Image_Header::js_2() – Display JavaScript based on Step 2.

Custom_Image_Header::js_includes() – Set up the enqueue for the JavaScript files.

Custom_Image_Header::js() – Execute JavaScript depending on step.

Custom_Image_Header::process_default_headers() – Process the default headers

Custom_Image_Header::remove_header_image() – Remove a header image.

Custom_Image_Header::reset_header_image() – Reset a header image to the default image for the theme.

Custom_Image_Header::set_header_image() – Choose a header image, selected from existing uploaded and default headers, or provide an array of uploaded header data (either new, or from media library).

Custom_Image_Header::show_header_selector() – Display UI for selecting one of several default headers.

Custom_Image_Header::step_1() – Display first step of custom header image page.

Custom_Image_Header::step_2_manage_upload() – Upload the file to be cropped in the second step.

Custom_Image_Header::step_2() – Display second step of custom header image page.