Using remove_page and remove_submenu_page functions to remove admin menus WordPress

remove_wordpress_admin_menus.php

<?php 

/**
 *  Using remove_page and remove_submenu_page functions to remove admin menus WordPress
 */ 
 
#1. Remove the main menu item together with the subpages  

add_action( 'admin_menu', 'remove_admin_menu_items', 999 );

function remove_admin_menu_items() {

   remove_menu_page('index.php');
 
}

#2. Remove the the subpages  or submenu 

add_action( 'admin_menu', 'remove_admin_menu_items', 999 );

function remove_admin_menu_items() {

  remove_submenu_page('index.php','update-core.php' );

}

/**
 *  Using unset() function to remove admin menus WordPress
 */ 
 
 
 # Testing the array for visualization 

//add the action hook to admin_menu event

add_action( 'admin_menu', 'remove_admin_menu_items', 999 );

//callback function 
function remove_admin_menu_items() {
	
	//Admin menu array->List of all the WordPress admin menu items are in this array
	global $submenu; 
	
	//print the array to the screen so that we can see the admin menu items by index
	print('<pre>'); 
	print_r($submenu); 
	print('<pre>'); 
	
	// we remove everything else displayed on the screen so that see only the admin menu items array 
	die(); 
	
} 

#1. Remove the main menu item together with the subpages  using unset

add_action( 'admin_menu', 'remove_admin_menu_items', 999 );

function remove_admin_menu_items() {
	
	global $submenu; 

  unset($submenu['index.php'][0]); //remove top level menu index.php (dashboard menu - Home menu ) 
	unset($submenu['index.php'][10]); // remove the submenu update-core.php (updates menu) 

}

#2. Remove the main submenu item using unset 

add_action( 'admin_menu', 'remove_admin_menu_items', 999 );

function remove_admin_menu_items() {
	
	  global $submenu; 

    unset($submenu['index.php'][10]);
}