Restrict certain pages to logged in users only

imv-restrict.php

<?php

/*
  Plugin Name: BP Restrict
  Plugin URI:
  Description: Restrict wordpress pages to logged in users
  Version: 1.2.0
  Author: Ali Roshan
  Author Email: [email protected]
  License:

  Copyright 2011 Ali Roshan ([email protected])

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2, as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

class BPRestrict {
    /* --------------------------------------------*
     * Constants
     * -------------------------------------------- */
    private $redirect = 'register';
    private $pages = array(
        'members'
        //,'groups'
    );

    /**
     * Constructor
     */
    function __construct() {
        //Hook up to the init action
        add_action('init', array(&$this, 'bpr_MembersOnly'));
    }

    function bpr_MembersOnly() {
        if (!is_user_logged_in()) {
            $page_slug = end(explode("/", rtrim($_SERVER['REQUEST_URI'], '/')));
            if (in_array($page_slug, $this->pages)) {
                wp_redirect(site_url($this->redirect));
                exit();
            }
        }
    }

}

// end class
new BPRestrict();