WP: Remove update notification for all users except ADMIN user

gistfile1

// REMOVE THE WORDPRESS UPDATE NOTIFICATION FOR ALL USERS EXCEPT SYSADMIN
// This code will ensures that no users other than "admin" are notified by wordpress when updates are available..
global $user_login;
get_currentuserinfo();
if ($user_login !== "admin") { // change admin to the username that gets the updates
	add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
	add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );
}

// Changed version to only show update notification for admin users (as opposed to just the user 'admin'):

// REMOVE THE WORDPRESS UPDATE NOTIFICATION FOR ALL USERS EXCEPT SYSADMIN
global $user_login;
get_currentuserinfo();
if (!current_user_can('update_plugins')) { // checks to see if current user can update plugins 
	add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
	add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );
}