How To Create Admin Menu For WordPress Plugin

At first, we will follow the reference of WordPress documentation.

We will use this function in the plugin.

add_menu_page( string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '', string $icon_url = '', int $position = null )

add_menu_page() function which takes seven parameters:

(string) (Required) The text to be displayed in the title tags of the page when the menu is selected.

(string) (Required) The text to be used for the menu.

(string) (Required) The capability required for this menu to be displayed to the user.

(string) (Required) The slug name to refer to this menu by. Should be unique for this menu page and only include lowercase alphanumeric, dashes, and underscores characters to be compatible with sanitize_key().

(callable) (Optional) The function to be called to output the content for this page.

Default value: ‘ ‘

(string) (Optional) The URL to the icon to be used for this menu.

Pass a base64-encoded SVG using a data URI, which will be colored to match the color scheme. This should begin with ‘data:image/svg+xml;base64,’.
Pass the name of a Dashicons helper class to use a font icon, e.g. ‘dashicons-chart-pie’.
Pass ‘none’ to leave div.wp-menu-image empty so an icon can be added via CSS.
Default value: ‘ ‘

(int) (Optional) The position in the menu order this item should appear.

Default value: null

Now we will create a simple plugin named Top Bar Notice and will create a admin menu. Just place this code inside index.php file in the plugin.

Plugin Name: Ari Top Bar Notice
Description: This plugin is made for personal usage.
Plugin URI:
Version: 1.0
Author: Ariful
Author URI:
Text Domain: ari-top-bar-notice

add_action('admin_menu', 'ari_top_bar_notice_menu');
function ari_top_bar_notice_menu() {
    $page_title = 'Top Bar Notice';
    $menu_title = 'Top Bar Notice';
    $capability = 'manage_options';
    $menu_slug = 'ari-top-bar-notice';
    $function = 'ari_top_bar_notice_page_callback';
    $icon_url = 'dashicons-megaphone';
    $position = 30;
    add_menu_page($page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position);

Now we can see this menu appearing in the dashboard like this.