Hide menus and plugins from users

<?php
/* Hide some plugins from the plugin list from everyone except user id 1 */
/* Even other administrators can't see them */
define( 'Z1_ADMIN_USER', 1 );

$remove_these = array(
      'limit-login-attempts/limit-login-attempts.php',
      'wordpress-firewall-2/wordpress-firewall-2.php',
      'update-notifier/update-notifier.php',
      'wp-super-cache/wp-cache.php',
      'audit-trail/audit-trail.php',
      'wpmudev-updates/update-notifications.php',
     );

add_filter('all_plugins', 'z1_remove_some_plugins');
function z1_remove_some_plugins($all) {
    global $remove_these, $current_user;
    if ( isset( $current_user ) && ( Z1_ADMIN_USER != $current_user->id ) ) {
        foreach($all as $file => $data) {
            if (in_array($file, $remove_these))
                unset($all[$file]);
        }
    }
    return $all;
} // end z1_remove_some_plugins

/* Hide some menuss from everyone except user id 1 */
/* Even other administrators can't see them */
$remove_menus = array(
                      array( 'options-general.php', 'limit-login-attempts' ), // submenu
                      array( 'options-general.php', 'update-notifier' ),
                      'edit-comments.php', // top level core menu
                      'wpcf7', // top level plugin menu (contact form 7)
                      array( 'options-general.php', 'wpsupercache' ),
                     );

add_action('admin_init', 'z1_remove_some_menus');
function z1_remove_some_menus() {
    global $remove_menus, $current_user;

    if ( isset( $current_user ) && ( Z1_ADMIN_USER != $current_user->id ) ) {
        foreach ( $remove_menus as $m ) {
            if ( is_array( $m ) ) {
                remove_submenu_page( $m[0], $m[1] );
            } else {
                 remove_menu_page( $m );
            }
        }
    }
} // end z1_remove_some_menus