WordPress - Display update notification for Admins

functions.php

/* Adding this PHP code to the functions.php of WordPress theme will only display WordPress update notifications to admin users. */

global $user_login;
get_currentuserinfo();
if (!current_user_can('update_plugins')) {
    add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
    add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );
}