is_wp_error( mixed $thing )

Check whether variable is a ClassicPress Error.

Description

Returns true if $thing is an object of the WP_Error class.

Parameters

$thing

(mixed) (Required) Check if unknown variable is a WP_Error object.

Return

(bool) True, if WP_Error. False, if not WP_Error.

Source

File: wp-includes/load.php 

function is_wp_error( $thing ) {
	return ( $thing instanceof WP_Error );
}

Expand Source Code View on GitHub

Related

Used By

Used By
Used By Description
wp-admin/includes/update-core.php: cp_get_core_checksums()

Gets the checksums for the given version of ClassicPress.
wp-signup.php: signup_blog()

Setup the new site signup
wp-signup.php: validate_another_blog_signup()

Validate a new site signup.
wp-signup.php: signup_user()

Setup the new user signup process
wp-signup.php: show_blog_form()

Generates and displays the Signup and Create Site forms
wp-signup.php: show_user_form()

Display user registration form
wp-signup.php: signup_another_blog()

Allow returning users to sign up for another site
wp-login.php: retrieve_password()

Handles sending password retrieval email to user.
wp-includes/class-wp-http-ixr-client.php: WP_HTTP_IXR_Client::query()
wp-login.php: login_header()

Output the login page header.
wp-includes/deprecated.php: wp_get_http()

Perform a HTTP HEAD or GET request.
wp-includes/deprecated.php: url_is_accessable_via_ssl()

Determines if the URL can be accessed over SSL.
wp-includes/deprecated.php: image_resize()

Scale down an image to fit a particular size and save a new copy of the image.
wp-includes/deprecated.php: user_pass_ok()

Check that the user login name and password is correct.
wp-includes/deprecated.php: get_category_children()

Retrieve category children list separated before and after the term IDs.
wp-includes/customize/class-wp-customize-nav-menu-setting.php: WP_Customize_Nav_Menu_Setting::update()

Create/update the nav_menu term for this setting.
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php: WP_Customize_Nav_Menu_Item_Setting::get_original_title()

Get original title.
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php: WP_Customize_Nav_Menu_Item_Setting::value_as_wp_post_nav_menu_item()

Get the value emulated into a WP_Post and set up as a nav_menu_item.
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php: WP_Customize_Nav_Menu_Item_Setting::update()

Creates/updates the nav_menu_item post for this setting.
wp-includes/class-wp-image-editor-gd.php: WP_Image_Editor_GD::resize()

Resizes current image.
wp-includes/class-wp-image-editor-gd.php: WP_Image_Editor_GD::multi_resize()

Resize multiple images from a single source.
wp-includes/class-wp-image-editor-gd.php: WP_Image_Editor_GD::save()

Saves current in-memory image to file.
wp-includes/rest-api/fields/class-wp-rest-meta-fields.php: WP_REST_Meta_Fields::update_value()

Updates meta values.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::sanitize_params()

Sanitizes (where possible) the params on the request.
wp-includes/rest-api/class-wp-rest-request.php: WP_REST_Request::has_valid_params()

Checks whether this request is valid according to its attributes.
wp-includes/rest-api/class-wp-rest-server.php: WP_REST_Server::dispatch()

Matches the request to a callback and call it.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::get_item_permissions_check()

Checks if a given request has access to read the comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::get_item()

Retrieves a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::create_item()

Creates a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::update_item_permissions_check()

Checks if a given REST request has access to update a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::update_item()

Updates a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::delete_item_permissions_check()

Checks if a given request has access to delete a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::delete_item()

Deletes a comment.
wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php: WP_REST_Comments_Controller::check_comment_author_email()

Checks a comment author email for validity.
wp-includes/rest-api/class-wp-rest-server.php: WP_REST_Server::serve_request()

Handles serving an API request.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::get_item_permissions_check()

Checks if a given request has access to read a user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::get_item()

Retrieves a single user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::create_item()

Creates a single user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::update_item_permissions_check()

Checks if a given request has access to update a user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::update_item()

Updates a single user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::delete_item_permissions_check()

Checks if a given request has access delete a user.
wp-includes/rest-api/endpoints/class-wp-rest-users-controller.php: WP_REST_Users_Controller::delete_item()

Deletes a single user.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::get_item_permissions_check()

Checks if a request has access to read or edit the specified term.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::get_item()

Gets a single term from a taxonomy.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::create_item()

Creates a single term in a taxonomy.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::update_item_permissions_check()

Checks if a request has access to update the specified term.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::update_item()

Updates a single term from a taxonomy.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::delete_item_permissions_check()

Checks if a request has access to delete the specified term.
wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php: WP_REST_Terms_Controller::delete_item()

Deletes a single term from a taxonomy.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::create_item_permissions_check()

Checks if a given request has access to create an attachment.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::create_item()

Creates a single attachment.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::update_item()

Updates a single attachment.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::upload_from_data()

Handles an upload via raw POST data.
wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::upload_from_file()

Handles an upload via multipart/form-data ($_FILES).
wp-includes/rest-api/endpoints/class-wp-rest-settings-controller.php: WP_REST_Settings_Controller::prepare_value()

Prepares a value for output based off a schema array.
wp-includes/rest-api/endpoints/class-wp-rest-settings-controller.php: WP_REST_Settings_Controller::update_item()

Updates settings for the settings object.
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::get_items_permissions_check()

Checks if a given request has access to get revisions.
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::get_items()

Gets a collection of revisions.
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::get_item()

Retrieves one revision from the collection.
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::delete_item_permissions_check()

Checks if a given request has access to delete a revision.
wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::delete_item()

Deletes a single revision.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::handle_terms()

Updates the post’s terms from a REST request.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::sanitize_post_statuses()

Sanitizes and validates the list of post statuses, including whether the user can query private statuses.
wp-includes/rest-api/endpoints/class-wp-rest-controller.php: WP_REST_Controller::update_additional_fields_for_object()

Updates the values of additional fields added to a data object.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::update_item()

Updates a single post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::delete_item_permissions_check()

Checks if a given request has access to delete a post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::delete_item()

Deletes a single post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::prepare_item_for_database()

Prepares a single post for create or update.
wp-includes/widgets/class-wp-widget-rss.php: WP_Widget_RSS::widget()

Outputs the content for the current RSS widget instance.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::get_item_permissions_check()

Checks if a given request has access to read a post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::get_item()

Retrieves a single post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::create_item()

Creates a single post.
wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::update_item_permissions_check()

Checks if a given request has access to update a post.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::load()

Loads image from $this->file into new Imagick Object.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::set_quality()

Sets Image Compression quality on a 1-100% scale.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::resize()

Resizes current image.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::multi_resize()

Resize multiple images from a single source.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::crop()

Crops Image.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::rotate()

Rotates current image counter-clockwise by $angle.
wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::save()

Saves current image to file.
wp-includes/widgets/class-wp-widget-media.php: WP_Widget_Media::update()

Sanitizes the widget form values as they are saved.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::wp_ajax_update_widget()

Updates widget settings asynchronously.
wp-includes/media.php: wp_get_image_editor()

Returns a WP_Image_Editor instance and loads file into it.
wp-includes/media.php: image_make_intermediate_size()

Resizes an image to make a thumbnail or intermediate size.
wp-includes/pluggable-deprecated.php: wp_login()

Checks a users login information and logs them in if it checks out. This function is deprecated.
wp-includes/class-wp-query.php: WP_Query::get_queried_object()

Retrieve queried object.
wp-includes/class-wp-tax-query.php: WP_Tax_Query::get_sql_for_clause()

Generate SQL JOIN and WHERE clauses for a “first-order” query clause.
wp-includes/class-wp-tax-query.php: WP_Tax_Query::clean_query()

Validates a single query.
wp-includes/class-wp-tax-query.php: WP_Tax_Query::transform_query()

Transforms a single query, from one field to another.
wp-includes/pluggable.php: get_avatar()

Retrieve the avatar <img> tag for a user, email address, MD5 hash, comment, or post.
wp-includes/class-wp-network.php: WP_Network::get_instance()

Retrieve a network from the database by its ID.
wp-includes/pluggable.php: wp_authenticate()

Authenticate a user, confirming the login credentials are valid.
wp-includes/nav-menu.php: wp_delete_nav_menu()

Delete a Navigation Menu.
wp-includes/nav-menu.php: wp_update_nav_menu_object()

Save the properties of a menu or create a new menu with those properties.
wp-includes/nav-menu.php: wp_update_nav_menu_item()

Save the properties of a menu item or create a new one.
wp-includes/nav-menu.php: wp_get_nav_menu_items()

Retrieves all menu items of a navigation menu.
wp-includes/nav-menu.php: wp_setup_nav_menu_item()

Decorates a menu item object with the shared navigation menu item properties.
wp-includes/nav-menu.php: is_nav_menu()

Check if the given ID is a navigation menu.
wp-includes/nav-menu.php: is_nav_menu_item()

Determines whether the given ID is a nav menu item.
wp-includes/comment.php: wp_handle_comment_submission()

Handles the submission of a comment, usually posted to wp-comments-post.php via a comment form.
wp-includes/nav-menu.php: wp_get_nav_menu_object()

Returns a navigation menu object.
wp-includes/comment.php: trackback()

Send a Trackback.
wp-includes/comment.php: discover_pingback_server_uri()

Finds a pingback server URI based on the given URL.
wp-includes/comment.php: wp_new_comment()

Adds a new comment to the database.
wp-includes/comment.php: wp_get_comment_fields_max_lengths()

Retrieves the maximum character lengths for the comment form fields.
wp-includes/class-wp-ajax-response.php: WP_Ajax_Response::add()

Appends data to an XML response based on given arguments.
wp-includes/nav-menu-template.php: wp_nav_menu()

Displays a navigation menu.
wp-includes/admin-bar.php: wp_admin_bar_edit_menu()

Provide an edit link for posts and terms.
wp-includes/bookmark.php: get_bookmark_field()

Retrieve single bookmark data item or field.
wp-includes/link-template.php: get_avatar_data()

Retrieves default data about the avatar.
wp-includes/link-template.php: get_adjacent_post()

Retrieves the adjacent post.
wp-includes/link-template.php: get_edit_term_link()

Retrieves the URL for editing a given term.
wp-includes/link-template.php: get_term_feed_link()

Retrieves the feed link for a term.
wp-includes/link-template.php: get_permalink()

Retrieves the full permalink for the current post or post ID.
wp-includes/link-template.php: get_post_permalink()

Retrieves the permalink for a post of a custom post type.
wp-includes/capabilities.php: map_meta_cap()

Map meta capabilities to primitive capabilities.
wp-includes/class-wp-site.php: WP_Site::get_instance()

Retrieves a site from the database by its ID.
wp-includes/post-formats.php: get_post_format_link()

Returns a link to a post format index.
wp-includes/class-http.php: WP_Http::request()

Send an HTTP request to a URI.
wp-includes/class-http.php: WP_Http::_dispatch_request()

Dispatches a HTTP request to a supporting transport.
wp-includes/http.php: wp_remote_retrieve_header()

Retrieve a single header by name from the raw response.
wp-includes/http.php: wp_remote_retrieve_response_code()

Retrieve only the response code from the raw response.
wp-includes/http.php: wp_remote_retrieve_response_message()

Retrieve only the response message from the raw response.
wp-includes/http.php: wp_remote_retrieve_body()

Retrieve only the body from the raw response.
wp-includes/http.php: wp_remote_retrieve_cookies()

Retrieve only the cookies from the raw response.
wp-includes/http.php: wp_remote_retrieve_headers()

Retrieve only the headers from the raw response.
wp-includes/user.php: wp_create_user_request()

Create and log a user request to perform a specific action.
wp-includes/user.php: get_password_reset_key()

Creates, stores, then returns a password reset key for user.
wp-includes/user.php: register_new_user()

Handles registering a new user.
wp-includes/user.php: wp_update_user()

Update a user in the database.
wp-includes/wp-db.php: wpdb::process_field_charsets()

Adds field charsets to field/value/format arrays generated by the wpdb::process_field_formats() method.
wp-includes/wp-db.php: wpdb::process_field_lengths()

For string fields, record the maximum string length that field can safely save.
wp-includes/wp-db.php: wpdb::get_col_charset()

Retrieves the character set for the given column.
wp-includes/wp-db.php: wpdb::get_col_length()

Retrieve the maximum string length allowed in a given column.
wp-includes/wp-db.php: wpdb::strip_invalid_text_from_query()

Strips any invalid characters from the query.
wp-includes/wp-db.php: wpdb::strip_invalid_text_for_column()

Strips any invalid characters from the string for a given table and column.
wp-includes/user.php: wp_signon()

Authenticates and logs a user in with ‘remember’ capability.
wp-includes/user.php: wp_authenticate_username_password()

Authenticate a user, confirming the username and password are valid.
wp-includes/user.php: wp_authenticate_email_password()

Authenticates a user using the email and password.
wp-includes/class-wp-theme.php: WP_Theme::errors()

Returns errors property.
wp-includes/theme.php: wp_update_custom_css_post()

Update the custom_css post for a given theme.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newCategory()

Create new category.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editComment()

Edit comment.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newComment()

Create new comment.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_newPost()

Creates new post.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_newPost()

Create a new post.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_editPost()

Edit a post.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::pingback_ping()

Retrieves a pingback and registers it.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::login()

Log user in.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_insert_post()

Helper method for wp_newPost() and wp_editPost(), containing shared logic.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newTerm()

Create a new term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editTerm()

Edit a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deleteTerm()

Delete a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerm()

Retrieve a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerms()

Retrieve all terms for a taxonomy.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editProfile()

Edit user’s profile.
wp-includes/category-template.php: the_tags()

Retrieve the tags for a post.
wp-includes/category-template.php: term_description()

Retrieve term description.
wp-includes/category-template.php: get_the_terms()

Retrieve the terms of the taxonomy that are attached to the post.
wp-includes/category-template.php: get_the_term_list()

Retrieve a post’s terms as a list with specified format.
wp-includes/category-template.php: get_term_parents_list()

Retrieve term parents with separator.
wp-includes/category-template.php: the_terms()

Display the terms in a list.
wp-includes/category-template.php: has_term()

Check if the current post has any of given terms.
wp-includes/category-template.php: wp_tag_cloud()

Display tag cloud.
wp-includes/category-template.php: get_category_link()

Retrieve category link URL.
wp-includes/category-template.php: get_the_category()

Retrieve post categories.
wp-includes/category-template.php: get_the_category_by_ID()

Retrieve category name based on category ID.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::_publish_changeset_values()

Publish changeset values.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::handle_load_themes_request()

Load themes into the theme browsing/installation UI.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::changeset_data()

Get changeset data.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::import_theme_starter_content()

Import theme starter content into the customized state.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::post_value()

Returns the sanitized value for a given setting from the current customized state.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::validate_setting_values()

Validates setting values.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::prepare_setting_validity_for_js()

Prepares setting validity for exporting to the client (JS).
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::save()

Handle customize_save WP Ajax request to save/update a changeset.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::save_changeset_post()

Save the post for the loaded changeset.
wp-includes/post-template.php: get_post_class()

Retrieves the classes for the post div as an array.
wp-includes/post-template.php: get_body_class()

Retrieve the classes for the body element as an array.
wp-includes/canonical.php: redirect_canonical()

Redirects incoming links to the proper URL based on the site url.
wp-includes/class-wp-simplepie-file.php: WP_SimplePie_File::__construct()

Constructor.
wp-includes/rest-api.php: rest_validate_value_from_schema()

Validate a value based on a schema.
wp-includes/rest-api.php: rest_parse_request_arg()

Parse a request argument based on details registered to the route.
wp-includes/rest-api.php: rest_ensure_response()

Ensures a REST response is a response object (for consistency).
wp-includes/post.php: wp_get_post_parent_id()

Return the post’s parent’s post_ID
wp-includes/class-wp-customize-nav-menus.php: WP_Customize_Nav_Menus::insert_auto_draft_post()

Add a new auto-draft post.
wp-includes/class-wp-customize-nav-menus.php: WP_Customize_Nav_Menus::ajax_insert_auto_draft_post()

Ajax handler for adding a new auto-draft post.
wp-includes/class-wp-customize-nav-menus.php: WP_Customize_Nav_Menus::ajax_load_available_items()

Ajax handler for loading available menu items.
wp-includes/class-wp-customize-nav-menus.php: WP_Customize_Nav_Menus::load_available_items_query()

Performs the post_type and taxonomy queries for loading available menu items.
wp-includes/ms-functions.php: maybe_add_existing_user_to_blog()

Add a new user to a blog by visiting /newbloguser/{key}/.
wp-includes/ms-functions.php: add_new_user_to_blog()

Adds a newly created user to the appropriate blog
wp-includes/ms-functions.php: wpmu_activate_signup()

Activate a signup.
wp-includes/ms-functions.php: wpmu_create_user()

Create a user.
wp-includes/ms-functions.php: get_active_blog_for_user()

Get one of a user’s active blogs
wp-includes/ms-functions.php: add_user_to_blog()

Adds a user to a blog.
wp-includes/formatting.php: sanitize_option()

Sanitises various option values based on the nature of the option.
wp-includes/class-wp-editor.php: _WP_Editors::editor_settings()
wp-includes/load.php: wp_set_wpdb_vars()

Set the database table prefix and the format specifiers for database table columns.
wp-includes/update.php: wp_version_check()

Check WordPress version against the newest version.
wp-includes/update.php: wp_update_plugins()

Check plugin versions against the latest versions hosted on WordPress.org.
wp-includes/update.php: wp_update_themes()

Check theme versions against the latest versions hosted on WordPress.org.
wp-includes/category.php: _make_cat_compat()

Update category structure to old pre 2.3 from new taxonomy structure.
wp-includes/taxonomy.php: is_object_in_term()

Determine if the given object is associated with any of the given terms.
wp-includes/taxonomy.php: get_ancestors()

Get an array of ancestor IDs for a given object.
wp-includes/taxonomy.php: wp_get_term_taxonomy_parent_id()

Returns the term’s parent’s term_ID.
wp-includes/category.php: get_categories()

Retrieve list of category objects.
wp-includes/category.php: get_category()

Retrieves category data given a category ID or category object.
wp-includes/category.php: get_category_by_path()

Retrieve category based on URL containing the category slug.
wp-includes/category.php: get_cat_name()

Retrieve the name of a category from its ID.
wp-includes/taxonomy.php: get_term_link()

Generate a permalink for a taxonomy term archive.
wp-includes/taxonomy.php: _get_term_children()

Get the subset of $terms that are descendants of $term_id.
wp-includes/taxonomy.php: wp_unique_term_slug()

Will make slug unique, if it isn’t already.
wp-includes/taxonomy.php: wp_update_term()

Update term based on arguments provided.
wp-includes/taxonomy.php: get_object_term_cache()

Retrieves the taxonomy relationship to the term object id.
wp-includes/taxonomy.php: wp_set_object_terms()

Create Term and Taxonomy Relationships.
wp-includes/taxonomy.php: wp_remove_object_terms()

Remove term(s) associated with a given object.
wp-includes/taxonomy.php: wp_delete_term()

Removes a term from the database.
wp-includes/taxonomy.php: wp_insert_term()

Add a new term to the database.
wp-includes/taxonomy.php: get_term()

Get all Term data from database by Term ID.
wp-includes/taxonomy.php: get_term_by()

Get all Term data from database by Term field and data.
wp-includes/taxonomy.php: get_term_field()

Get sanitized Term field.
wp-includes/taxonomy.php: get_term_to_edit()

Sanitizes Term for editing.
wp-includes/revision.php: _wp_put_post_revision()

Inserts post data into the posts table as a post revision.
wp-includes/revision.php: wp_restore_post_revision()

Restores a post to the specified revision.
wp-includes/widgets.php: wp_widget_rss_process()

Process RSS feed widget data and optionally retrieve feed items.
wp-includes/class-oembed.php: WP_oEmbed::fetch()

Connects to a oEmbed provider and returns the result.
wp-includes/widgets.php: wp_widget_rss_output()

Display the RSS entries in a list.
wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::validate()

Validates an input.
wp-includes/rss.php: _fetch_remote_file()

Retrieve URL headers and content using WP HTTP Request API.
wp-includes/functions.php: wp_send_json_error()

Send a JSON response back to an Ajax request, indicating failure.
wp-includes/functions.php: _default_wp_die_handler()

Kills ClassicPress execution and display HTML message with error message.
wp-includes/functions.php: wp_remote_fopen()

HTTP request for URI to retrieve content.
wp-includes/functions.php: wp_get_http_headers()

Retrieve HTTP Headers from URL.
wp-admin/custom-header.php: 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.
wp-admin/custom-header.php: Custom_Image_Header::step_2()

Display second step of custom header image page.
wp-admin/custom-header.php: Custom_Image_Header::step_3()

Display third step of custom header image page.
wp-admin/update-core.php: do_core_upgrade()

Upgrade ClassicPress core display.
wp-admin/includes/deprecated.php: wp_dashboard_plugins_output()

Display plugins text for the ClassicPress news widget.
wp-admin/includes/class-theme-upgrader-skin.php: Theme_Upgrader_Skin::after()
wp-admin/includes/image.php: wp_crop_image()

Crop an Image to a given size.
wp-admin/includes/image.php: wp_generate_attachment_metadata()

Generate post thumbnail attachment meta data.
wp-admin/includes/class-automatic-upgrader-skin.php: Automatic_Upgrader_Skin::feedback()
wp-admin/includes/misc.php: heartbeat_autosave()

Autosave with heartbeat
wp-admin/includes/misc.php: show_message()

Displays the given administration message.
wp-admin/includes/media.php: media_upload_form()

Outputs the legacy media upload form.
wp-admin/includes/media.php: media_upload_type_form()

Outputs the legacy media upload form for a given media type.
wp-admin/includes/media.php: wp_media_upload_handler()

Handles the process of uploading media.
wp-admin/includes/media.php: media_sideload_image()

Downloads an image from the specified URL and attaches it to a post.
wp-admin/includes/media.php: media_handle_upload()

Save a file submitted from a POST request and create an attachment post for it.
wp-admin/includes/media.php: media_handle_sideload()

Handles a side-loaded file in the same way as an uploaded file is handled by media_handle_upload().
wp-admin/includes/class-bulk-upgrader-skin.php: Bulk_Upgrader_Skin::error()
wp-admin/includes/class-bulk-upgrader-skin.php: Bulk_Upgrader_Skin::after()
wp-admin/includes/image-edit.php: wp_save_image()

Saves image to post along with enqueued changes in $_REQUEST[‘history’]
wp-admin/includes/schema.php: populate_network()

Populate network settings.
wp-admin/includes/network.php: network_step1()

Prints step 1 for Network installation process.
wp-admin/includes/network.php: network_step2()

Prints step 2 for Network installation process.
wp-admin/includes/image-edit.php: wp_stream_image()

Streams image in WP_Image_Editor to browser.
wp-admin/includes/image-edit.php: stream_preview_image()

Streams image in post to browser, along with enqueued changes in $_REQUEST[‘history’]
wp-admin/includes/nav-menu.php: wp_get_nav_menu_to_edit()

Returns the menu formatted to edit.
wp-admin/includes/nav-menu.php: wp_nav_menu_update_menu_items()

Saves nav menu items
wp-admin/includes/translation-install.php: translations_api()

Retrieve translations from ClassicPress Translation API.
wp-admin/includes/translation-install.php: wp_get_available_translations()

Get available translations from the ClassicPress.net API.
wp-admin/includes/translation-install.php: wp_download_language_pack()

Download a language pack.
wp-admin/includes/translation-install.php: wp_can_install_language_pack()

Check if ClassicPress has access to the filesystem without asking for credentials.
wp-admin/includes/nav-menu.php: _wp_ajax_menu_quick_search()

Prints the appropriate response to a menu quick search.
wp-admin/includes/nav-menu.php: wp_nav_menu_item_post_type_meta_box()

Displays a meta box for a post type menu item.
wp-admin/includes/nav-menu.php: wp_nav_menu_item_taxonomy_meta_box()

Displays a meta box for a taxonomy menu item.
wp-admin/includes/class-wp-upgrader-skin.php: WP_Upgrader_Skin::error()
wp-admin/includes/class-wp-upgrader-skin.php: WP_Upgrader_Skin::decrement_update_count()

Output JavaScript that calls function to decrement the update counts.
wp-admin/includes/plugin-install.php: plugins_api()

Retrieves plugin installer pages from the ClassicPress.net Plugins API.
wp-admin/includes/plugin-install.php: install_popular_tags()

Retrieve popular ClassicPress plugin tags.
wp-admin/includes/plugin-install.php: install_dashboard()
wp-admin/includes/plugin-install.php: install_plugin_information()

Display plugin information in dialog box form.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::check_parent_theme_filter()

Check if a child theme is being installed and we need to install its parent.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::install()

Install a theme package.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::upgrade()

Upgrade a theme.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::check_package()

Check that the package source contains a valid theme.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::current_before()

Turn on maintenance mode before attempting to upgrade the current theme.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::current_after()

Turn off maintenance mode after upgrading the current theme.
wp-admin/includes/class-theme-upgrader.php: Theme_Upgrader::delete_old_theme()

Delete the old theme during an upgrade.
wp-admin/includes/theme-install.php: install_themes_feature_list()

Retrieve list of ClassicPress theme features (aka theme tags)
wp-admin/includes/theme-install.php: install_theme_information()

Display theme information in dialog box form.
wp-admin/includes/class-wp-links-list-table.php: WP_Links_List_Table::column_categories()

Handles the link categories column output.
wp-admin/includes/class-core-upgrader.php: Core_Upgrader::upgrade()

Upgrade ClassicPress core.
wp-admin/includes/ajax-actions.php: wp_ajax_wp_privacy_erase_personal_data()

Ajax handler for erasing personal data.
wp-admin/includes/ajax-actions.php: wp_ajax_edit_theme_plugin_file()

Ajax handler for editing a theme or plugin file.
wp-admin/includes/ajax-actions.php: wp_ajax_wp_privacy_export_personal_data()

Ajax handler for exporting a user’s personal data.
wp-admin/includes/ajax-actions.php: wp_ajax_crop_image()

Ajax handler for cropping an image.
wp-admin/includes/ajax-actions.php: wp_ajax_install_theme()

Ajax handler for installing a theme.
wp-admin/includes/ajax-actions.php: wp_ajax_update_theme()

Ajax handler for updating a theme.
wp-admin/includes/ajax-actions.php: wp_ajax_delete_theme()

Ajax handler for deleting a theme.
wp-admin/includes/ajax-actions.php: wp_ajax_install_plugin()

Ajax handler for installing a plugin.
wp-admin/includes/ajax-actions.php: wp_ajax_update_plugin()

Ajax handler for updating a plugin.
wp-admin/includes/ajax-actions.php: wp_ajax_delete_plugin()

Ajax handler for deleting a plugin.
wp-admin/includes/ajax-actions.php: wp_ajax_query_themes()

Ajax handler for getting themes from themes_api().
wp-admin/includes/ajax-actions.php: wp_ajax_wp_fullscreen_save_post()

Ajax handler for saving posts from the fullscreen editor.
wp-admin/includes/ajax-actions.php: wp_ajax_inline_save_tax()

Ajax handler for quick edit saving for a term.
wp-admin/includes/ajax-actions.php: wp_ajax_upload_attachment()

Ajax handler for uploading attachments
wp-admin/includes/ajax-actions.php: wp_ajax_replyto_comment()

Ajax handler for replying to a comment.
wp-admin/includes/ajax-actions.php: wp_ajax_add_menu_item()

Ajax handler for adding a menu item.
wp-admin/includes/ajax-actions.php: wp_ajax_add_meta()

Ajax handler for adding meta.
wp-admin/includes/ajax-actions.php: wp_ajax_add_user()

Ajax handler for adding a user.
wp-admin/includes/ajax-actions.php: wp_ajax_add_link_category()

Ajax handler for adding a link category.
wp-admin/includes/ajax-actions.php: wp_ajax_add_tag()

Ajax handler to add a tag.
wp-admin/includes/ajax-actions.php: wp_ajax_get_tagcloud()

Ajax handler for getting a tagcloud.
wp-admin/includes/ajax-actions.php: _wp_ajax_add_hierarchical_term()

Ajax handler for adding a hierarchical term.
wp-admin/includes/ajax-actions.php: wp_ajax_delete_tag()

Ajax handler for deleting a tag.
wp-admin/includes/ajax-actions.php: wp_ajax_delete_link()

Ajax handler for deleting a link.
wp-admin/includes/ajax-actions.php: wp_ajax_dim_comment()

Ajax handler to dim a comment.
wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::prepare_items()
wp-admin/includes/upgrade.php: wp_check_mysql_version()

Checks the version of the installed MySQL binary.
wp-admin/includes/class-wp-upgrader.php: WP_Upgrader::fs_connect()

Connect to the filesystem.
wp-admin/includes/class-wp-upgrader.php: WP_Upgrader::download_package()

Download a package.
wp-admin/includes/class-wp-upgrader.php: WP_Upgrader::unpack_package()

Unpack a compressed package file.
wp-admin/includes/class-wp-upgrader.php: WP_Upgrader::install_package()

Install a package.
wp-admin/includes/class-wp-upgrader.php: WP_Upgrader::run()

Run an upgrade/installation.
wp-admin/includes/update-core.php: update_core()

Upgrades the core of ClassicPress.
wp-admin/includes/class-wp-automatic-updater.php: WP_Automatic_Updater::update()

Update an item, if appropriate.
wp-admin/includes/class-wp-automatic-updater.php: WP_Automatic_Updater::after_core_update()

If we tried to perform a core update, check if we should send an email, and if we need to avoid processing future updates.
wp-admin/includes/class-wp-automatic-updater.php: WP_Automatic_Updater::send_email()

Sends an email upon the completion or failure of a background core update.
wp-admin/includes/class-wp-automatic-updater.php: WP_Automatic_Updater::send_debug_email()

Prepares and sends an email of a full log of background update results, useful for debugging and geekery.
wp-admin/includes/class-plugin-upgrader-skin.php: Plugin_Upgrader_Skin::after()
wp-admin/includes/class-theme-installer-skin.php: Theme_Installer_Skin::after()
wp-admin/includes/user.php: WP_Privacy_Requests_Table::process_bulk_action()

Process bulk actions.
wp-admin/includes/user.php: _wp_privacy_resend_request()

Resend an existing request and return the result.
wp-admin/includes/user.php: _wp_personal_data_handle_actions()

Handle list table actions.
wp-admin/includes/theme.php: delete_theme()

Remove a theme
wp-admin/includes/theme.php: get_theme_feature_list()

Retrieve list of ClassicPress theme features (aka theme tags)
wp-admin/includes/theme.php: themes_api()

Retrieves theme installer pages from the ClassicPress.net Themes API.
wp-admin/includes/class-walker-nav-menu-edit.php: Walker_Nav_Menu_Edit::start_el()

Start the element output.
wp-admin/includes/plugin.php: activate_plugin()

Attempts activation of plugin in a “sandbox” and redirects on success.
wp-admin/includes/plugin.php: activate_plugins()

Activate multiple plugins.
wp-admin/includes/plugin.php: delete_plugins()

Remove directory and files of a plugin for a list of plugins.
wp-admin/includes/plugin.php: validate_active_plugins()

Validate active plugins
wp-admin/includes/file.php: request_filesystem_credentials()

Displays a form to the user to request for their FTP/SSH details in order to connect to the filesystem.
wp-admin/includes/file.php: wp_privacy_process_personal_data_export_page()

Intercept personal data exporter page ajax responses in order to assemble the personal data export file.
wp-admin/includes/file.php: download_url()

Downloads a URL to a local temporary file using the ClassicPress HTTP Class.
wp-admin/includes/file.php: unzip_file()

Unzips a specified ZIP file to a location on the Filesystem via the ClassicPress Filesystem Abstraction.
wp-admin/includes/file.php: copy_dir()

Copies a directory from one location to another via the ClassicPress Filesystem Abstraction.
wp-admin/includes/file.php: WP_Filesystem()

Initialises and connects the ClassicPress Filesystem Abstraction classes.
wp-admin/includes/class-language-pack-upgrader.php: Language_Pack_Upgrader::check_package()

Check the package source to make sure there are .mo and .po files.
wp-admin/includes/class-plugin-installer-skin.php: Plugin_Installer_Skin::after()
wp-admin/includes/class-wp-ajax-upgrader-skin.php: WP_Ajax_Upgrader_Skin::error()

Stores a log entry for an error.
wp-admin/includes/class-wp-ajax-upgrader-skin.php: WP_Ajax_Upgrader_Skin::feedback()

Stores a log entry.
wp-admin/includes/post.php: wp_create_post_autosave()

Creates autosave data for the specified post from $_POST data.
wp-admin/includes/post.php: post_preview()

Saves a draft or manually autosaves for the purpose of showing a post preview.
wp-admin/includes/import.php: register_importer()

Register importer for ClassicPress.
wp-admin/includes/post.php: _wp_get_allowed_postdata()

Applies a blacklist to post data fields used in editing functions.
wp-admin/includes/post.php: edit_post()

Update an existing post with values provided in $_POST.
wp-admin/includes/post.php: bulk_edit_posts()

Process the post data for the bulk editing of posts.
wp-admin/includes/post.php: wp_write_post()

Creates a new post from the “Write Post” form using $_POST information.
wp-admin/includes/post.php: write_post()

Calls wp_write_post() and handles the errors.
wp-admin/includes/dashboard.php: wp_check_browser_version()

Check if the user needs a browser update
wp-admin/includes/dashboard.php: cp_dashboard_petitions_output()

Display the ClassicPress petitions feeds.
wp-admin/includes/dashboard.php: wp_dashboard_rss_control()

The RSS dashboard widget control.
wp-admin/includes/class-wp-theme-install-list-table.php: WP_Theme_Install_List_Table::prepare_items()
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::upgrade()

Upgrade a plugin.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::check_package()

Check a source package to be sure it contains a plugin.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::deactivate_plugin_before_upgrade()

Deactivates a plugin before it is upgraded.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::delete_old_plugin()

Delete the old plugin during an upgrade.
wp-admin/includes/update.php: get_core_checksums()

Gets the checksums for the given version of ClassicPress.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::install()

Install a plugin package.
wp-admin/includes/taxonomy.php: wp_insert_category()

Updates an existing Category or creates a new Category.
wp-admin/includes/taxonomy.php: get_terms_to_edit()

Get comma-separated list of terms available to edit for the given post ID.
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Changelog
Version Description
WP-2.1.0 Introduced.