The following classes were created by WordPress developers, and are found in files capabilities.php, classes.php, class-snoopy.php, locale.php, query.php, rewrite.php, script-loader.php, wp-db.php:- WP – general request handling
- WP_Ajax_Response – AJAX handling
- WP_Object_Cache (formerly WP_Cache) – Object cache (and functions wp_cache_add, wp_cache_close, wp_cache_delete, wp_cache_flush, wp_cache_get, wp_cache_init, wp_cache_replace, wp_cache_set)
- WP_Error – error handling (and function is_wp_error)
- WP_Locale – handles date and time locales
- WP_Query – Request parsing and manipulation, posts fetching (with functions get_query_var, query_posts, have_posts, in_the_loop, rewind_posts, the_post, wp_old_slug_redirect, setup_postdata, as well as the Conditional Tags is_*)
- WP_Rewrite – Rewrite rules (and functions add_rewrite_rule, add_rewrite_tag, add_feed, add_rewrite_endpoint, url_to_postid)
- WP_Roles, WP_Role, WP_User – Users and capabilities – map_meta_cap, current_user_can, get_role, add_role, remove_role
- WP_Scripts – JavaScript loading (and functions wp_print_scripts, wp_register_script, wp_deregister_script wp_enqueue_script)
- WP_Styles – CSS stylesheet loading (and functions wp_print_styles, wp_register_style, wp_deregister_style, wp_enqueue_style )
- Display tree-like data – Walker, Walker_Page, Walker_PageDropdown, Walker_Category, Walker_CategoryDropdown
- wpdb – Database interface
The following classes were created by outside developers, and are found in files class-IXR.php, class-pop3.php, class-snoopy.php, gettext.php, rss.php, streams.php: - IXR – XML-RPC Classes, including IXR_Value, IXR_Message, IXR_Server, IXR_IntrospectionServer, IXR_Request, IXR_Client, IXR_ClientMulticall, IXR_Error, IXR_Date, IXR_Base64
- Snoopy – HTTP client
- gettext_reader (part of PHP-gettext) – Localization Class
- RSS Classes (MagpieRSS and RSSCache) (and functions fetch_rss, is_info, is_success, is_redirect, is_error, is_client_error, is_server_error, parse_w3cdtf, wp_rss, get_rss)
- POP3: SquirrelMail wrapper
- StreamReader, StringReader, FileReader, CachedFileReader
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