page_header.php

这是php编的论坛的原代码

<?php
/***************************************************************************
 *                              page_header.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : [e-mail]
 *
 *   $Id: page_header.php,v 1.1.1.2 2003/02/13 06:19:50 wei.gao Exp $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   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.
 *
 ***************************************************************************/

if ( !defined('IN_PHPBB') )
{
	die("Hacking attempt");
}

define('HEADER_INC', TRUE);

//
// gzip_compression
//
$do_gzip_compress = FALSE;
if ( $board_config['gzip_compress'] )
{
	$phpver = phpversion();

	$useragent = (isset($_SERVER["HTTP_USER_AGENT"]) ) ? $_SERVER["HTTP_USER_AGENT"] : $HTTP_USER_AGENT;

	if ( $phpver >= '4.0.4pl1' && ( strstr($useragent,'compatible') || strstr($useragent,'Gecko') ) )
	{
		if ( extension_loaded('zlib') )
		{
			ob_start('ob_gzhandler');
		}
	}
	else if ( $phpver > '4.0' )
	{
		if ( strstr($HTTP_SERVER_VARS['HTTP_ACCEPT_ENCODING'], 'gzip') )
		{
			if ( extension_loaded('zlib') )
			{
				$do_gzip_compress = TRUE;
				ob_start();
				ob_implicit_flush(0);

				header('Content-Encoding: gzip');
			}
		}
	}
}

//
// Parse and show the overall header.
//
$template->set_filenames(array(
	'overall_header' => ( empty($gen_simple_header) ) ? 'overall_header.tpl' : 'simple_header.tpl')
);

//
// Generate logged in/logged out status
//
if ( $userdata['session_logged_in'] )
{
	$u_login_logout = 'login.'.$phpEx.'?logout=true&amp;sid=' . $userdata['session_id'];
	$l_login_logout = $lang['Logout'] . ' [ ' . $userdata['username'] . ' ]';
}
else
{
	$u_login_logout = 'login.'.$phpEx;
	$l_login_logout = $lang['Login'];
}

$s_last_visit = ( $userdata['session_logged_in'] ) ? create_date($board_config['default_dateformat'], $userdata['user_lastvisit'], $board_config['board_timezone']) : '';

//
// Get basic (usernames + totals) online
// situation
//
$logged_visible_online = 0;
$logged_hidden_online = 0;
$guests_online = 0;
$online_userlist = '';

if (defined('SHOW_ONLINE'))
{

	$user_forum_sql = ( !empty($forum_id) ) ? "AND s.session_page = " . intval($forum_id) : '';
	$sql = "SELECT u.username, u.user_id, u.user_allow_viewonline, u.user_level, s.session_logged_in, s.session_ip
		FROM ".USERS_TABLE." u, ".SESSIONS_TABLE." s
		WHERE u.user_id = s.session_user_id
			AND s.session_time >= ".( time() - 300 ) . "
			$user_forum_sql
		ORDER BY u.username ASC, s.session_ip ASC";
	if( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, 'Could not obtain user/online information', '', __LINE__, __FILE__, $sql);
	}

	$userlist_ary = array();
	$userlist_visible = array();

	$prev_user_id = 0;
	$prev_user_ip = '';

	while( $row = $db->sql_fetchrow($result) )
	{
		// User is logged in and therefor not a guest
		if ( $row['session_logged_in'] )
		{
			// Skip multiple sessions for one user
			if ( $row['user_id'] != $prev_user_id )
			{
				$style_color = '';
				if ( $row['user_level'] == ADMIN )
				{
					$row['username'] = '<b>' . $row['username'] . '</b>';
					$style_color = 'style="color:#' . $theme['fontcolor3'] . '"';
				}
				else if ( $row['user_level'] == MOD )
				{
					$row['username'] = '<b>' . $row['username'] . '</b>';
					$style_color = 'style="color:#' . $theme['fontcolor2'] . '"';
				}

				if ( $row['user_allow_viewonline'] )
				{
					$user_online_link = '<a href="' . append_sid("profile.$phpEx?mode=viewprofile&amp;" . POST_USERS_URL . "=" . $row['user_id']) . '"' . $style_color .'>' . $row['username'] . '</a>';
					$logged_visible_online++;
				}
				else
				{
					$user_online_link = '<a href="' . append_sid("profile.$phpEx?mode=viewprofile&amp;" . POST_USERS_URL . "=" . $row['user_id']) . '"' . $style_color .'><i>' . $row['username'] . '</i></a>';
					$logged_hidden_online++;
				}

				if ( $row['user_allow_viewonline'] || $userdata['user_level'] == ADMIN )
				{
					$online_userlist .= ( $online_userlist != '' ) ? ', ' . $user_online_link : $user_online_link;
				}
			}

			$prev_user_id = $row['user_id'];
		}
		else
		{
			// Skip multiple sessions for one user
			if ( $row['session_ip'] != $prev_session_ip )
			{
				$guests_online++;
			}
		}

		$prev_session_ip = $row['session_ip'];
	}
	$db->sql_freeresult($result);

	if ( empty($online_userlist) )
	{
		$online_userlist = $lang['None'];
	}
	$online_userlist = ( ( isset($forum_id) ) ? $lang['Browsing_forum'] : $lang['Registered_users'] ) . ' ' . $online_userlist;

	$total_online_users = $logged_visible_online + $logged_hidden_online + $guests_online;

	if ( $total_online_users > $board_config['record_online_users'])
	{
		$board_config['record_online_users'] = $total_online_users;
		$board_config['record_online_date'] = time();

		$sql = "UPDATE " . CONFIG_TABLE . "
			SET config_value = '$total_online_users'
			WHERE config_name = 'record_online_users'";
		if ( !$db->sql_query($sql) )
		{
			message_die(GENERAL_ERROR, 'Could not update online user record (nr of users)', '', __LINE__, __FILE__, $sql);
		}

		$sql = "UPDATE " . CONFIG_TABLE . "
			SET config_value = '" . $board_config['record_online_date'] . "'
			WHERE config_name = 'record_online_date'";
		if ( !$db->sql_query($sql) )
		{
			message_die(GENERAL_ERROR, 'Could not update online user record (date)', '', __LINE__, __FILE__, $sql);
		}
	}

	if ( $total_online_users == 0 )
	{
		$l_t_user_s = $lang['Online_users_zero_total'];
	}
	else if ( $total_online_users == 1 )
	{
		$l_t_user_s = $lang['Online_user_total'];
	}
	else
	{
		$l_t_user_s = $lang['Online_users_total'];
	}

	if ( $logged_visible_online == 0 )
	{
		$l_r_user_s = $lang['Reg_users_zero_total'];
	}
	else if ( $logged_visible_online == 1 )
	{
		$l_r_user_s = $lang['Reg_user_total'];
	}
	else
	{
		$l_r_user_s = $lang['Reg_users_total'];
	}

	if ( $logged_hidden_online == 0 )
	{
		$l_h_user_s = $lang['Hidden_users_zero_total'];
	}
	else if ( $logged_hidden_online == 1 )
	{
		$l_h_user_s = $lang['Hidden_user_total'];
	}
	else
	{
		$l_h_user_s = $lang['Hidden_users_total'];
	}

	if ( $guests_online == 0 )
	{
		$l_g_user_s = $lang['Guest_users_zero_total'];
	}
	else if ( $guests_online == 1 )
	{
		$l_g_user_s = $lang['Guest_user_total'];
	}
	else
	{
		$l_g_user_s = $lang['Guest_users_total'];
	}

	$l_online_users = sprintf($l_t_user_s, $total_online_users);
	$l_online_users .= sprintf($l_r_user_s, $logged_visible_online);
	$l_online_users .= sprintf($l_h_user_s, $logged_hidden_online);