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Project Type: WordPress Reference

Admin Bar Functions

Functions for managing the WordPress admin bar, defined in wp-includes/admin-bar.php. Visibility Functions show_admin_bar() Sets the display status of the admin bar globally. show_admin_bar( bool $show ): void Parameters: $show (bool)...

February 12, 2026 Read More

Admin Bar Hooks

Filters and actions for customizing the WordPress admin bar. Actions admin_bar_init Fires after WP_Admin_Bar is initialized. do_action( 'admin_bar_init' ); Location: WP_Admin_Bar::initialize() Timing: After user data populated, scripts/styles enqueued, before menus...

February 12, 2026 Read More

WP_List_Table API

WP_List_Table is the base class for displaying data in admin tables (posts, users, comments, etc.). While marked for internal use, it's widely used by plugin developers. Class Overview File: wp-admin/includes/class-wp-list-table.php...

February 12, 2026 Read More

Meta Boxes API

Meta boxes are draggable content boxes that appear on edit screens in WordPress admin. They're used for custom fields, taxonomies, and additional post/page options. Core Functions add_meta_box() Adds a meta...

February 12, 2026 Read More

Plugin & Theme Installation API

WordPress provides a comprehensive upgrader system for installing, updating, and managing plugins and themes. The core class is WP_Upgrader with specialized subclasses. Class Hierarchy WP_Upgrader (base class) ├── Plugin_Upgrader ├──...

February 12, 2026 Read More

Screen Options API

Screen Options provide user-configurable settings for admin screens, appearing in the collapsible panel at the top of admin pages. Core Functions add_screen_option() Register and configure a screen option. add_screen_option( string...

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Settings API

The WordPress Settings API provides a standardized way to create and manage settings pages. It handles form generation, validation, sanitization, and storage. Core Concepts Settings - Individual options stored in...

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Update Functions API

WordPress provides APIs for checking, managing, and applying updates to core, plugins, themes, and translations. Checking for Updates Core Updates // Get available core updates $updates = get_core_updates(); if (...

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Admin Bar API Overview

The Admin Bar (also called Toolbar) API provides a way to add, modify, and remove items from the WordPress admin bar that appears at the top of both front-end and...

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Admin Functions (admin.php)

wp-admin/includes/admin.php is the core loader for WordPress admin APIs. It does not define many public functions itself; instead it loads the admin-only APIs that developers use in the dashboard. This...

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