index.php

<?php
ob_start();
session_set_cookie_params(0);
session_start();
/*******************************************************
 *   Copyright (C) 2014  http://isvipi.org

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

    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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 ******************************************************/ 
 
 //let us check the requested url and if it is prefixed with www we redirect to non-www
 if (substr($_SERVER['HTTP_HOST'], 0, 4) === 'www.') {
    header('Location: http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on' ? 's':'').'://' . substr($_SERVER['HTTP_HOST'], 4).$_SERVER['REQUEST_URI']);
    exit;
}

/*** We won't do much here,  just load our site */
require( dirname( __FILE__ ) . '/isv_loader.php' );

ob_end_flush();