Admin Menu (category)
| add_menu_page() | Add a top-level menu page to the Dashboard (next to Posts, Pages, Users etc). |
| add_meta_box() | Adds additional blocks (meta box) on the edit/create post, page, or custom post type screens in the admin panel. |
| add_options_page() | Adds a child page (submenu) to the admin panel menu "Settings". |
| add_submenu_page() | Adds a child page (subsection) of the specified main menu in the admin panel. |
| add_theme_page() | Adds a submenu to the "Appearance" menu in the admin panel. |
| do_meta_boxes() | Outputs any meta boxes registered for the admin panel page and a specific context, using the function add_meta_box(). |
| get_admin_page_title() | Gets the title of the admin page. |
| get_admin_url() | Retrieves the URL to the site admin area. |
| get_current_screen() | Gets the data object of the current admin panel page. |
| includes_url() | Retrieves the URL to the wp-includes directory with the appropriate protocol: 'https' or 'http'. |
| is_admin() | Checks if the user is in the admin panel of the site (console or any other admin page). Conditional tag. |
| remove_menu_page() | Remove a top-level admin menu item, ex: "Posts", "Media", "Pages". |
| remove_meta_box() | Deletes meta-boxes (additional blocks in the admin panel) on the post, page, and custom post type editing screens. |
| remove_submenu_page() | Deletes a submenu item from the WordPress admin panel. For example, |
| wp_add_dashboard_widget() | Adds (register) a new widget (a meta box) to the administration dashboard (the main page of the admin panel). |
| wp_admin_notice() | Forms and displays the HTML code of a note (message, error) at the top of the admin panel page. |
| wp_get_admin_notice() | Forms and returns the HTML code of a notice (message, error) that we usually see at the top of the admin panel. |
| wp_maintenance() | Stops the site from functioning and displays a message about maintenance (the site is in development mode). |