Typical phpBB 3.x page including header and footer

<?php
// phpBB initialization
define('IN_PHPBB', true);
$phpbb_root_path = (defined('PHPBB_ROOT_PATH')) ? PHPBB_ROOT_PATH : './';
$phpEx = substr(strrchr(__FILE__, '.'), 1);
include($phpbb_root_path . 'common.' . $phpEx);
$user->session_begin();
$auth->acl($user->data);
$user->setup();

// require user to be logged in
if (!$auth->acl_gets('u_viewprofile', 'a_user', 'a_useradd', 'a_userdel'))
{
    if ($user->data['user_id'] != ANONYMOUS)
    {
        trigger_error('NO_VIEW_USERS');
    }

    login_box('', ((isset($user->lang['LOGIN_EXPLAIN_' . strtoupper($mode)])) ? $user->lang['LOGIN_EXPLAIN_' . strtoupper($mode)] : $user->lang['LOGIN_EXPLAIN_MEMBERLIST']));
}

// here we build the actual contents
$title = 'Hello '.$user->data['username'];
$body = 'You are user number '.$user->data['user_id'];

// finally put them into a standard page template
$template->assign_vars(array('MESSAGE_TITLE' => $title, 'MESSAGE_TEXT' => $body));
page_header($title, false);
$template->set_filenames(array('body' => 'message_body.html'));
page_footer();
?>