Register Multiple Admin Menu Locations in WordPress

register-multiple-admin-menu-locations-wp.php

<?php
/**
 * Plugin Name:       Fancy Tools: Multiple Admin Menu Locations
 * Plugin URI:        https://dlxplugins.com
 * Description:       A demo plugin showing how to register a menu in multiple locations.
 * Version:           1.0.0
 * Requires at least: 6.0
 * Requires PHP:      7.3
 * Author:            DLX Plugins
 * Author URI:        https://dlxplugins.com
 * License:           GPL v2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 *
 * @package DLXPlugins\FancyTools
 */

namespace DLXPlugins\FancyTools;

define( 'FANCY_TOOLS_ADMIN_URL', admin_url( 'tools.php?page=fancy-plugin' ) );

/**
 * Initialize the admin panel.
 */
add_action( 'admin_menu', __NAMESPACE__ . '\add_admin_menu' );

/**
 * Add the admin menu.
 */
function add_admin_menu() {
	add_management_page(
		'Fancy Tools',
		'Fancy Tools',
		'manage_options',
		'fancy-plugin',
		__NAMESPACE__ . '\output_admin_page',
		10
	);
	$hook = add_options_page(
		'Fancy Tools',
		'Fancy Tools',
		'manage_options',
		'fancy-plugin',
		'__return_empty_string',
		10
	);
	define( 'FANCY_TOOLS_OPTIONS_HOOK', $hook );
}

/**
 * Output the admin page.
 */
function output_admin_page() {
	?>
	<div class="wrap">
		<h1>Fancy Tools</h1>
		<p>Here is some fancy content.</p>
	</div>
	<?php
}

// Add a redirect to the admin settings.
add_action( 'current_screen', __NAMESPACE__ . '\maybe_redirect_to_settings', 10 );

/**
 * Redirect to settings if someone tries to access the options menu.
 */
function maybe_redirect_to_settings() {
	if ( ! is_admin() ) {
		return;
	}
	$screen = get_current_screen();

	if ( defined( 'FANCY_TOOLS_OPTIONS_HOOK' ) && FANCY_TOOLS_OPTIONS_HOOK === $screen->id ) {
		wp_safe_redirect( esc_url_raw( FANCY_TOOLS_ADMIN_URL ) );
		exit;
	}
}