is_wp_error( mixed $thing )

Check whether variable is a WordPress Error.

Description
- Parameters
- Return
- Source
- Changelog
Related
- Used By
User Contributed Notes

Description Description

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

Parameters Parameters

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

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Return Return

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

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Source Source

File: wp-includes/load.php

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

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Changelog Changelog

Changelog
Version	Description
2.1.0	Introduced.

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Used By Used By

Used By
Used By	Description
wp-includes/ms-site.php: wp_insert_site()	Inserts a new site into the database.
wp-includes/ms-site.php: wp_update_site()	Updates a site in the database.
wp-includes/functions.php: _wp_die_process_input()	Processes arguments passed to {@see wp_die()} consistently for its handlers.
wp-admin/includes/misc.php: wp_check_php_version()	Checks if the user needs to update PHP.
wp-admin/includes/post.php: _wp_get_allowed_postdata()	Returns only allowed post data fields
wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php: WP_REST_Search_Controller::get_items()	Retrieves a collection of search results.
wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php: WP_REST_Search_Controller::prepare_item_for_response()	Prepares a single search result for response.
wp-includes/rest-api/endpoints/class-wp-rest-search-controller.php: WP_REST_Search_Controller::sanitize_subtypes()	Sanitizes the list of subtypes, to ensure only subtypes of the passed type are included.
wp-includes/rest-api/endpoints/class-wp-rest-themes-controller.php: WP_REST_Themes_Controller::sanitize_theme_status()	Sanitizes and validates the list of theme status.
wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php: WP_REST_Autosaves_Controller::get_items_permissions_check()	Checks if a given request has access to get autosaves.
wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php: WP_REST_Autosaves_Controller::create_item()	Creates, updates or deletes an autosave revision.
wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php: WP_REST_Autosaves_Controller::get_items()	Gets a collection of autosaves using wp_get_post_autosave.
wp-includes/rest-api/endpoints/class-wp-rest-autosaves-controller.php: WP_REST_Autosaves_Controller::create_post_autosave()	Creates autosave for the specified post.
wp-includes/class-wp-block-type.php: WP_Block_Type::prepare_attributes_for_render()	Validates attributes against the current block schema, populating defaulted and missing values.
wp-includes/user.php: wp_create_user_request()	Create and log a user request to perform a specific action.
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/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/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_wp_privacy_erase_personal_data()	Ajax handler for erasing personal data.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::handle_load_themes_request()	Load themes into the theme browsing/installation UI.
wp-admin/includes/ajax-actions.php: wp_ajax_edit_theme_plugin_file()	Ajax handler for editing a theme or plugin file.
wp-includes/category-template.php: get_term_parents_list()	Retrieve term parents with separator.
wp-includes/widgets/class-wp-widget-media.php: WP_Widget_Media::update()	Sanitizes the widget form values as they are saved.
wp-admin/includes/ajax-actions.php: wp_ajax_get_community_events()	Handles AJAX requests for community events
wp-admin/includes/class-wp-community-events.php: WP_Community_Events::get_events()	Gets data about events near a particular location.
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/class-wp-customize-manager.php: WP_Customize_Manager::_publish_changeset_values()	Publish changeset values.
wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::save_changeset_post()	Save the post for the loaded changeset.
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::changeset_data()	Get changeset data.
wp-includes/theme.php: wp_update_custom_css_post()	Update the `custom_css` post for a given theme.
wp-includes/rest-api/fields/class-wp-rest-meta-fields.php: WP_REST_Meta_Fields::update_value()	Updates meta values.
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-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::get_item_permissions_check()	Checks if a given request has access to read a user.
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-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-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-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::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::create_item_permissions_check()	Checks if a given request has access to create an attachment.
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-terms-controller.php: WP_REST_Terms_Controller::delete_item()	Deletes a single term from a taxonomy.
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::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-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-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::prepare_item_for_database()	Prepares a single post for create or update.
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/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::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-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-comments-controller.php: WP_REST_Comments_Controller::check_comment_author_email()	Checks a comment author email for validity.
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::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/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/customize/class-wp-customize-nav-menu-item-setting.php: WP_Customize_Nav_Menu_Item_Setting::get_original_title()	Get original title.
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-setting.php: WP_Customize_Setting::validate()	Validates an input.
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/ajax-actions.php: wp_ajax_delete_plugin()	Ajax handler for deleting a plugin.
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-includes/class-wp-site.php: WP_Site::get_instance()	Retrieves a site from the database by its ID.
wp-includes/user.php: wp_authenticate_email_password()	Authenticates a user using the email and password.
wp-includes/comment.php: wp_get_comment_fields_max_lengths()	Retrieves the maximum character lengths for the comment form fields.
wp-includes/class-wp-network.php: WP_Network::get_instance()	Retrieve a network from the database by its ID.
wp-includes/rest-api.php: rest_ensure_response()	Ensures a REST response is a response object (for consistency).
wp-includes/http.php: wp_remote_retrieve_cookies()	Retrieve only the cookies from the raw response.
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/class-wp-rest-server.php: WP_REST_Server::serve_request()	Handles serving an API request.
wp-includes/user.php: get_password_reset_key()	Creates, stores, then returns a password reset key for user.
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/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::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-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-admin/includes/class-wp-links-list-table.php: WP_Links_List_Table::column_categories()	Handles the link categories column output.
wp-admin/includes/ajax-actions.php: wp_ajax_crop_image()	Ajax handler for cropping an image.
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::process_field_lengths()	For string fields, record the maximum string length that field can safely save.
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/wp-db.php: wpdb::get_col_charset()	Retrieves the character set for the 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::process_field_charsets()	Adds field charsets to field/value/format arrays generated by the wpdb::process_field_formats() method.
wp-includes/link-template.php: get_avatar_data()	Retrieves default data about the avatar.
wp-admin/includes/ajax-actions.php: wp_ajax_update_plugin()	Ajax handler for updating a plugin.
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-admin/includes/translation-install.php: wp_can_install_language_pack()	Check if WordPress has access to the filesystem without asking for credentials.
wp-admin/includes/translation-install.php: translations_api()	Retrieve translations from WordPress Translation API.
wp-admin/includes/translation-install.php: wp_get_available_translations()	Get available translations from the WordPress.org API.
wp-admin/includes/translation-install.php: wp_download_language_pack()	Download a language pack.
wp-login.php: retrieve_password()	Handles sending password retrieval email to user.
wp-login.php: login_header()	Output the login page header.
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-signup.php: validate_another_blog_signup()	Validate a new site signup for an existing user.
wp-signup.php: signup_user()	Setup the new user signup process
wp-signup.php: signup_blog()	Setup the new site signup
wp-signup.php: show_blog_form()	Generates and displays the Signup and Create Site forms
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/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-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-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/class-core-upgrader.php: Core_Upgrader::upgrade()	Upgrade WordPress core.
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-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/class-plugin-upgrader.php: Plugin_Upgrader::install()	Install a plugin package.
wp-admin/includes/class-plugin-upgrader.php: Plugin_Upgrader::upgrade()	Upgrade a plugin.
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/theme.php: delete_theme()	Remove a theme
wp-admin/includes/theme.php: get_theme_feature_list()	Retrieve list of WordPress theme features (aka theme tags).
wp-admin/includes/theme.php: themes_api()	Retrieves theme installer pages from the WordPress.org Themes API.
wp-admin/includes/theme-install.php: install_themes_feature_list()	Retrieve list of WordPress 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-automatic-upgrader-skin.php: Automatic_Upgrader_Skin::feedback()
wp-admin/includes/class-theme-upgrader-skin.php: Theme_Upgrader_Skin::after()
wp-admin/includes/class-theme-installer-skin.php: Theme_Installer_Skin::after()
wp-admin/includes/class-plugin-installer-skin.php: Plugin_Installer_Skin::after()
wp-admin/includes/class-bulk-upgrader-skin.php: Bulk_Upgrader_Skin::after()
wp-admin/includes/class-bulk-upgrader-skin.php: Bulk_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/class-plugin-upgrader-skin.php: Plugin_Upgrader_Skin::after()
wp-admin/includes/class-wp-upgrader-skin.php: WP_Upgrader_Skin::error()
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/image-edit.php: wp_save_image()	Saves image to post along with enqueued changes in $_REQUEST[‘history’]
wp-admin/includes/image-edit.php: wp_stream_image()	Streams image in WP_Image_Editor to browser.
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/schema.php: populate_network()	Populate network settings.
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.
wp-admin/includes/class-wp-theme-install-list-table.php: WP_Theme_Install_List_Table::prepare_items()
wp-admin/includes/update.php: get_core_checksums()	Gets and caches the checksums for the given version of WordPress.
wp-admin/includes/image.php: wp_generate_attachment_metadata()	Generate post thumbnail attachment meta data.
wp-admin/includes/image.php: wp_crop_image()	Crop an Image to a given size.
wp-admin/includes/plugin-install.php: install_popular_tags()	Retrieve popular WordPress 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/plugin-install.php: plugins_api()	Retrieves plugin installer pages from the WordPress.org Plugins API.
wp-admin/includes/dashboard.php: wp_check_browser_version()	Check if the user needs a browser update
wp-admin/includes/deprecated.php: wp_dashboard_plugins_output()	Display plugins text for the WordPress news widget.
wp-admin/includes/dashboard.php: wp_dashboard_rss_control()	The RSS dashboard widget control.
wp-admin/includes/upgrade.php: wp_check_mysql_version()	Checks the version of the installed MySQL binary.
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/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::prepare_items()
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: media_upload_form()	Outputs the legacy media upload form.
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/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/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/ajax-actions.php: wp_ajax_query_themes()	Ajax handler for getting themes from themes_api().
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/ajax-actions.php: wp_ajax_upload_attachment()	Ajax handler for uploading attachments
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_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_inline_save_tax()	Ajax handler for quick edit saving for a term.
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/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_replyto_comment()	Ajax handler for replying to a comment.
wp-admin/includes/update-core.php: update_core()	Upgrades the core of WordPress.
wp-admin/includes/class-walker-nav-menu-edit.php: Walker_Nav_Menu_Edit::start_el()	Start the element output.
wp-admin/includes/nav-menu.php: wp_nav_menu_update_menu_items()	Saves nav menu items
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/nav-menu.php: wp_get_nav_menu_to_edit()	Returns the menu formatted to edit.
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: download_url()	Downloads a URL to a local temporary file using the WordPress HTTP API.
wp-admin/includes/file.php: unzip_file()	Unzips a specified ZIP file to a location on the filesystem via the WordPress Filesystem Abstraction.
wp-admin/includes/file.php: copy_dir()	Copies a directory from one location to another via the WordPress Filesystem Abstraction.
wp-admin/includes/file.php: WP_Filesystem()	Initialises and connects the WordPress Filesystem Abstraction classes.
wp-admin/includes/import.php: register_importer()	Register importer for WordPress.
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/includes/credits.php: wp_credits()	Retrieve the contributor credits.
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 WordPress core display.
wp-includes/capabilities.php: map_meta_cap()	Map meta capabilities to primitive capabilities.
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::post_value()	Returns the sanitized value for a given setting from the current customized state.
wp-includes/cron.php: spawn_cron()	Sends a request to run cron through HTTP request that doesn’t halt page loading.
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: 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()	Displays a tag cloud.
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_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/formatting.php: sanitize_option()	Sanitises various option values based on the nature of the option.
wp-includes/pluggable.php: get_avatar()	Retrieve the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post.
wp-includes/pluggable.php: wp_authenticate()	Authenticate a user, confirming the login credentials are valid.
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/class-wp-theme.php: WP_Theme::errors()	Returns errors property.
wp-includes/class-wp-query.php: WP_Query::get_queried_object()	Retrieve queried object.
wp-includes/category.php: get_cat_name()	Retrieve the name of a category from its ID.
wp-includes/category.php: _make_cat_compat()	Update category structure to old pre 2.3 from new taxonomy structure.
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/category.php: get_categories()	Retrieve list of category objects.
wp-includes/category.php: get_category_by_path()	Retrieve category based on URL containing the category slug.
wp-includes/category.php: get_category()	Retrieves category data given a category ID or category object.
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/load.php: wp_set_wpdb_vars()	Set the database table prefix and the format specifiers for database table columns.
wp-includes/class-http.php: WP_Http::_dispatch_request()	Dispatches a HTTP request to a supporting transport.
wp-includes/class-http.php: WP_Http::request()	Send an HTTP request to a URI.
wp-includes/deprecated.php: url_is_accessable_via_ssl()	Determines if the URL can be accessed over SSL.
wp-includes/functions.php: wp_send_json_error()	Send a JSON response back to an Ajax request, indicating failure.
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-includes/deprecated.php: wp_get_http()	Perform a HTTP HEAD or GET request.
wp-includes/widgets/class-wp-widget-rss.php: WP_Widget_RSS::widget()	Outputs the content for the current RSS widget instance.
wp-includes/widgets.php: wp_widget_rss_output()	Display the RSS entries in a list.
wp-includes/widgets.php: wp_widget_rss_process()	Process RSS feed widget data and optionally retrieve feed items.
wp-includes/class-wp-simplepie-file.php: WP_SimplePie_File::__construct()	Constructor.
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/taxonomy.php: wp_get_term_taxonomy_parent_id()	Returns the term’s parent’s term_ID.
wp-includes/taxonomy.php: get_object_term_cache()	Retrieves the taxonomy relationship to the term object id.
wp-includes/taxonomy.php: _get_term_children()	Get the subset of $terms that are descendants of $term_id.
wp-includes/taxonomy.php: get_term_link()	Generate a permalink for a taxonomy term archive.
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_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: wp_insert_term()	Add a new term to the database.
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: 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/taxonomy.php: get_term()	Get all Term data from database by Term ID.
wp-includes/link-template.php: get_adjacent_post()	Retrieves the adjacent post.
wp-includes/link-template.php: get_term_feed_link()	Retrieves the feed link for a term.
wp-includes/link-template.php: get_edit_term_link()	Retrieves the URL for editing a given 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/class-wp-ajax-response.php: WP_Ajax_Response::add()	Appends data to an XML response based on given arguments.
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/http.php: wp_remote_retrieve_headers()	Retrieve only the headers from the raw response.
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/class-oembed.php: WP_oEmbed::fetch()	Connects to a oEmbed provider and returns the result.
wp-includes/admin-bar.php: wp_admin_bar_edit_menu()	Provide an edit link for posts and terms.
wp-includes/user.php: wp_update_user()	Update a user in the database.
wp-includes/user.php: register_new_user()	Handles registering a new user.
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/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-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/nav-menu-template.php: wp_nav_menu()	Displays a navigation menu.
wp-includes/post-template.php: get_post_class()	Retrieves an array of the class names for the post container element.
wp-includes/post-template.php: get_body_class()	Retrieves an array of the class names for the body element.
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/post.php: wp_get_post_parent_id()	Returns the ID of the post’s parent.
wp-includes/canonical.php: redirect_canonical()	Redirects incoming links to the proper URL based on the site url.
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/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-deprecated.php: insert_blog()	Store basic site info in the blogs table.
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: wpmu_create_blog()	Create a site.
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/class-wp-http-ixr-client.php: WP_HTTP_IXR_Client::query()
wp-includes/bookmark.php: get_bookmark_field()	Retrieve single bookmark data item or field.
wp-includes/post-formats.php: get_post_format_link()	Returns a link to a post format index.
wp-includes/ms-blogs.php: update_blog_status()	Update a blog details field.
wp-includes/ms-blogs.php: update_blog_details()	Update the details for a blog. Updates the blogs table for a given blog id.
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_item()	Determines whether the given ID is a nav menu item.
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_get_nav_menu_object()	Returns a navigation menu object.
wp-includes/nav-menu.php: is_nav_menu()	Check if the given ID is a navigation menu.
wp-includes/rss.php: _fetch_remote_file()	Retrieve URL headers and content using WP HTTP Request API.
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::mw_editPost()	Edit a post.
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::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::wp_newCategory()	Create new category.
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/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::login()	Log user in.
wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::wp_ajax_update_widget()	Updates widget settings asynchronously.
wp-includes/comment.php: trackback()	Send a Trackback.
wp-includes/comment.php: wp_new_comment()	Adds a new comment to the database.
wp-includes/comment.php: discover_pingback_server_uri()	Finds a pingback server URI based on the given URL.
wp-includes/class-wp-editor.php: _WP_Editors::editor_settings()

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Contributed by Codex — 4 years ago
Example
```
if ( is_wp_error( $result ) ) {
	$error_string = $result->get_error_message();
	echo '<div id="message" class="error"><p>' . $error_string . '</p></div>';
}
```
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Contributed by Store Locator Plus — 3 years ago

The WP_Error class:
https://developer.wordpress.org/reference/classes/wp_error/

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is_wp_error( mixed $thing )

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is_wp_error( mixed $thing )

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