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The files of WordPress define many useful PHP Classes. This article will try to list all/most of the core classes.

Classes

The following classes were created by WordPress developers:

• _WP_Dependency - a WP_Dependencies queue item.
• AtomServer - WordPress AtomPub API implementation.
• Custom_Background
• Custom_Image_Header
• File_Upload_Upgrader - Upgrade Skin helper for File uploads.
• NOOP_Translations
• smtp
• text_diff
• text_diff_engine_native
• text_diff_engine_shell
• text_diff_engine_string
• text_diff_engine_xdiff
• text_diff_op
• text_diff_op_add
• text_diff_op_change
• text_diff_op_copy
• text_diff_op_delete
• text_diff_renderer
• text_diff_renderer_inline
• text_mappeddiff
• translation_entry
• Walker
  • Walker_Category
  • Walker_Category_Checklist
  • Walker_CategoryDropdown
  • Walker_Comment
  • Walker_Nav_Menu
  • Walker_Nav_Menu_Checklist
  • Walker_Nav_Menu_Edit
  • Walker_Page
  • Walker_PageDropDown
• WP - General request handling.
• WP_Admin_Bar - Controls display and creation of Admin bar.
• WP_Ajax_Response - Handles XML responses to AJAX requests.
• WP_Comment_Query - Request parsing and manipulation, comments fetching.
• WP_Customize_Manager - (Instanced) Handles customization of the Theme Customizer
• WP_Dependencies - Output a queue of items as HTML elements, some of which may depend on other items (requiring them to be processed first). Base class for WP_Styles and WP_Scripts.
• WP_Embed
• WP_Error - Error handling.
• WP_Feed_Cache
• WP_Feed_Cache_Transient
• WP_Filesystem_Base
  • WP_Filesystem_Direct
  • WP_Filesystem_Ftpext
  • WP_Filesystem_ftpsockets
  • WP_Filesystem_SSH2
• WP_http
• WP_http_cookie
• WP_http_curl
• WP_http_encoding
• WP_http_exthttp
• WP_http_fopen
• WP_http_fsockopen
• WP_http_proxy
• WP_http_streams
• WP_importer
• WP_Locale - Handles date and time locales.
• WP_matchesmapregex
• WP_Meta_Query - Generates the necessary SQL for meta-related queries.
• WP_nav_menu_widget
• WP_Object_Cache - Cache and regenerate data.
• WP_Oembed
• WP_Post - Represents a single post.
• WP_Query - Request parsing and manipulation, posts fetching.
• WP_Rewrite - Rewrite rules.
• WP_Role
• WP_Roles
• WP_Theme
• WP_Screen - Controls admin screens
• WP_Scripts - JavaScript loading.
• WP_Simplepie_File
• WP_Styles - CSS stylesheet loading.
• WP_Text_diff_renderer_inline
• WP_Text_diff_renderer_table
• WP_Upgrader
  • Core_Upgrader
  • Plugin_Upgrader
  • Theme_Upgrader
• WP_Upgrader_Skin
  • Bulk_Upgrader_Skin
    • Bulk_Plugin_Upgrader_Skin
    • Bulk_Theme_Upgrader_Skin
  • Plugin_Installer_Skin
  • Plugin_Upgrader_Skin
  • Theme_Installer_Skin
  • Theme_Upgrader_Skin
• WP_User
• WP_User_Query - Queries for users in the database.
• WP_Widget
  • WP_Widget_Archives
  • WP_Widget_Calendar
  • WP_Widget_Categories
  • WP_Widget_Links
  • WP_Widget_Meta
  • WP_Widget_Pages
  • WP_Widget_Recent_comments
  • WP_Widget_Recent_posts
  • WP_Widget_RSS
  • WP_Widget_Search
  • WP_Widget_Tag_cloud
  • WP_Widget_Text
• WP_Widget_Factory
• wp_xmlrpc_server
• wpdb - Database interface.

External Classes

The following classes are part of other packages included with WordPress.

AtomLib - Atom Syndication Format PHP Library.

• AtomLib

IXR - XML-RPC Classes: todo

Snoopy - HTTP client:

• Snoopy

PHP-gettext:

• gettext_reader - Localization Class

MagpieRSS - a simple RSS integration tool:

• MagpieRSS
• RSSCache

PclZip:

• PclZip - PclZip is the class that represent a Zip archive.

PemFTP - A Ftp implementation in pure PHP:

• ftp_base
  • ftp

PHPMailer - Email sending library for PHP:

• PHPMailer

PasswordHash - Portable PHP password hashing framework:

• PasswordHash

POMO:

• POMO_FileReader
• POMO_Reader
  • POMO_StringReader
    • POMO_CachedFileReader
      • POMO_CachedIntFileReader
• Translations
  • Gettext_Translations
    • MO

POP3 - SquirrelMail wrapper

• POP3

TinyMCE:

• SpellChecker
  • EnchantSpell
  • GoogleSpell
  • PSpell
  • PSpellShell
• Moxiecode_JSON
• Moxiecode_JSONReader
• Moxiecode_Logger

Services JSON - Converts to and from JSON format.

• Services_JSON
• Services_JSON_Error

SimplePie> - A PHP-Based RSS and Atom Feed Framework.

• SimplePie
• SimplePie_Author
• SimplePie_Cache
• SimplePie_Cache_DB
  • SimplePie_Cache_MySQL
• SimplePie_Cache_File
• SimplePie_Caption
• SimplePie_Category
• SimplePie_Content_Type_Sniffer - Content-type sniffing.
• SimplePie_Copyright
• SimplePie_Credit
• SimplePie_Decode_HTML_Entities - Decode HTML Entities.
• SimplePie_Enclosure
• SimplePie_File

Resources

• PHPXref for WordPress Classes
• WordPress PHPdoc Class trees

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