I

_cleanup_image_add_caption() – Private preg_replace callback used in image_add_caption()

_copy_image_file() – Copy an existing image file.

_crop_image_resource() – Crops an image resource. Internal use only.

_doing_it_wrong() – Mark something as being incorrectly called.

_excerpt_render_inner_columns_blocks() – Render inner blocks from the `core/columns` block for generating an excerpt.

_flip_image_resource() – Flips an image resource. Internal use only.

_get_non_cached_ids() – Retrieve IDs that are not already present in the cache.

_get_widget_id_base() – Retrieves the widget ID base value.

_image_get_preview_ratio() – Image preview ratio. Internal use only.

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

_ipad_meta() –

_is_valid_nav_menu_item() – Return if a menu item is valid.

_load_image_to_edit_path() – Retrieve the path or URL of an attachment’s attached file.

_load_textdomain_just_in_time() – Loads plugin and theme textdomains just-in-time.

_nav_menu_item_id_use_once() – Prevents a menu item ID from being used more than once.

_remove_qs_args_if_not_in_url() – Removes arguments from a query string if they are not present in a URL DO NOT use this in plugin code.

_rest_array_intersect_key_recursive() – Recursively computes the intersection of arrays using keys for comparison.

_rotate_image_resource() – Returns an image resource. Internal use only.

_sort_nav_menu_items() – Sort menu items by the desired key.

_usort_terms_by_ID() – Sort categories by ID.

_wp_add_additional_image_sizes() – Add additional default image sub-sizes.

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

_wp_customize_include() – Includes and instantiates the WP_Customize_Manager class.

_wp_die_process_input() – Processes arguments passed to wp_die() consistently for its handlers.

_wp_get_image_size_from_meta() – Get the image size as array from its meta data.

_wp_image_editor_choose() – Tests which editors are capable of supporting the request.

_wp_image_meta_replace_original() – Updates the attached file and image meta data when the original image was edited.

_wp_iso_convert() – Helper function to convert hex encoded chars to ASCII

_wp_menu_item_classes_by_context() – Adds the class property classes for the current context, if applicable.

_wp_sanitize_utf8_in_redirect() – URL encode UTF-8 characters in a URL.

$adjacent_image_link – filter

$type_upload_iframe_src – filter

add_clean_index() – Adds an index to a specified table.

add_custom_image_header() – Add callbacks for image header display.

add_image_size() – Register a new image size.

add_inline_data – action

adjacent_image_link() – Displays next or previous image link that has the same post parent.

admin_bar_init – action

admin_email_check_interval – filter

admin_email_remind_interval – filter

admin_init – action

admin_print_scripts-index.php – action

allow_subdirectory_install – filter

allow_subdirectory_install() – Allow subdirectory installation.

allow_subdomain_install() – Allow subdomain installation

application_password_is_api_request – filter

async_upload_image – filter

atom_site_icon() – Displays Site Icon in atom feeds.

AtomParser::is_declared_content_ns() –

attach_session_information – filter

attachment_icon – filter

attachment_id3_data_meta_box() – Display fields for ID3 data

attachment_innerHTML – filter

automatic_updates_is_vcs_checkout – filter

background_image() – Display background image path.

big_image_size_threshold – filter

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

check_import_new_users() – Checks if the current user has permissions to import new users.

check_is_user_spammed – filter

comment_author_IP() – Display the IP address of the author of the current comment.

comment_form_logged_in – filter

comment_form_logged_in_after – action

comment_form_must_log_in_after – action

comment_id_fields – filter

comment_id_fields() – Outputs hidden input HTML for replying to comments.

comment_id_not_found – action

comment_ID() – Display the comment id of the current comment.

commentrss2_item – action

convert_invalid_entities() – Converts invalid Unicode references range to valid range.

create_initial_post_types() – Creates the initial post types when ‘init’ action is fired.

create_initial_rest_routes() – Registers default REST API routes.

create_initial_taxonomies() – Creates the initial taxonomies.

create_initial_theme_features() – Creates the initial theme features when the ‘setup_theme’ action is fired.

crypto_aead_aes256gcm_is_available() –

crypto_aead_chacha20poly1305_ietf_decrypt() –

crypto_aead_chacha20poly1305_ietf_encrypt() –

crypto_generichash_init() –

current_theme_info() – Retrieves information on the current active theme.

Custom_Background::init() – Set up the hooks for the Custom Background admin page.

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.