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_add_themes_utility_last() – Adds the (theme) ‘Editor’ link to the bottom of the Appearance menu.

_convert_urlencoded_to_entities() – Preview fix for JavaScript bug with foreign languages.

_core_updated_successfully – action

_device_can_upload() – Test if the current device has the capability to upload files.

_get_additional_user_keys() – Returns a list of meta keys to be (maybe) populated in wp_update_user().

_make_url_clickable_cb() – Callback to convert URI match to HTML A element.

_maybe_update_core() – Determines whether core should be updated.

_maybe_update_plugins() – Check the last time plugins were run before checking plugin versions.

_maybe_update_themes() – Check themes versions only after a duration of time.

_register_widget_update_callback() – Registers the update callback for a widget.

_sort_uname_callback() – Callback to sort array by a ‘Name’ key.

_unzip_file_pclzip() – Attempts to unzip an archive using the PclZip library.

_unzip_file_ziparchive() – Attempts to unzip an archive using the ZipArchive class.

_update_blog_date_on_post_delete() – Handler for updating the blog date when a published post is deleted.

_update_blog_date_on_post_publish() – Handler for updating the blog date when a post is published or an already published post is changed.

_update_generic_term_count() – Will update term count based on number of objects.

_update_post_term_count() – Will update term count based on object types of the current taxonomy.

_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.

_upgrade_422_find_genericons_files_in_folder() – Recursively find Genericons example files in a given folder.

_upgrade_422_remove_genericons() – Cleans up Genericons example files.

_upgrade_440_force_deactivate_incompatible_plugins() –

_upgrade_cron_array() – Upgrade a Cron info array.

_user_admin_menu – action

_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.

_wp_can_use_pcre_u() – Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.

_WP_Editors::force_uncompressed_tinymce() – Force uncompressed TinyMCE when a custom theme has been defined.

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

_wp_get_current_user() – Retrieves the current user object.

_wp_get_user_contactmethods() – The old private function for setting up user contact methods.

_wp_handle_upload() – Handle PHP uploads in WordPress, sanitizing file names, checking extensions for mime type, and moving the file to the appropriate directory within the uploads directory.

_wp_relative_upload_path – filter

_wp_relative_upload_path() – Return relative path to an uploaded file.

_wp_remove_unregistered_widgets() – Compares a list of sidebars with their widgets against a whitelist.

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

_wp_timezone_choice_usort_callback() – Sort-helper for timezones.

_wp_translate_php_url_constant_to_key() – Translate a PHP_URL_* constant to the named array keys PHP uses.

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

_wp_upload_dir() – A non-filtered, non-cached version of wp_upload_dir() that doesn’t check the path.

$type_send_to_editor_url – filter

$type_upload_iframe_src – filter

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

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

add_option_update_handler() – Register a setting and its sanitization callback

add_user_meta() – Adds meta data to a user.

add_user_role – action

add_user_to_blog – action

add_user_to_blog() – Adds a user to a blog.

add_user() – Creates a new user from the "Users" form using $_POST information.

add_users_page() – Add submenu page to the Users/Profile main menu.

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

added_existing_user – action

added_usermeta – action

admin_created_user_email() –

admin_head-media-upload-popup – action

admin_print_scripts-media-upload-popup – action

admin_print_styles-media-upload-popup – action

admin_url – filter

admin_url() – Retrieves the URL to the admin area for the current site.

after_db_upgrade – action

after_mu_upgrade – action

after_signup_user – action

allow_dev_auto_core_updates – filter

allow_major_auto_core_updates – filter

allow_minor_auto_core_updates – filter

async_update_translation – filter

async_upload_$type – filter

async_upload_audio – filter

async_upload_file – filter

async_upload_image – filter

async_upload_video – filter

attachment_updated – action

attachment_url_to_postid – filter

attachment_url_to_postid() – Tries to convert an attachment URL into a post ID.

auth_cookie_bad_username – action

auto_core_update_email – filter

auto_core_update_send_email – filter

auto_update_$type – filter

autocomplete_users_for_site_admins – filter

automatic_updater_disabled – filter

automatic_updates_complete – action

automatic_updates_debug_email – filter

automatic_updates_is_vcs_checkout – filter

automatic_updates_send_debug_email – filter

Automatic_Upgrader_Skin

Automatic_Upgrader_Skin::feedback() –

Automatic_Upgrader_Skin::footer() –

Automatic_Upgrader_Skin::get_upgrade_messages() –

Automatic_Upgrader_Skin::header() –

Automatic_Upgrader_Skin::request_filesystem_credentials() – Determines whether the upgrader needs FTP/SSH details in order to connect to the filesystem.

bloginfo_url – filter

Bulk_Plugin_Upgrader_Skin

Bulk_Plugin_Upgrader_Skin::add_strings() –

Bulk_Plugin_Upgrader_Skin::after() –

Bulk_Plugin_Upgrader_Skin::before() –

Bulk_Plugin_Upgrader_Skin::bulk_footer() –

bulk_post_updated_messages – filter

Bulk_Theme_Upgrader_Skin

Bulk_Theme_Upgrader_Skin::add_strings() –