phpbb 3 源码解析02 --common.php

来源：互联网发布：linux iptables pdf 编辑：程序博客网时间：2024/06/08 01:51

这里是从index.php跳进来的

<?php/**** @package phpBB3* @version $Id: common.php 10299 2009-12-06 02:30:24Z naderman $* @copyright (c) 2005 phpBB Group* @license http://opensource.org/licenses/gpl-license.php GNU Public License** Minimum Requirement: PHP 4.3.3*//** * 这个是判断入口文件，主要是为了安全，防止非法调用。*/if (!defined('IN_PHPBB')){exit;}//开始时间/* * microtime()返回当前 Unix 时间戳和微秒数 * 在php5里可以加参数true直接返回一个浮点数，这里没有这样用，可能是为了版本兼容性。 * */$starttime = explode(' ', microtime());$starttime = $starttime[1] + $starttime[0];// Report all errors, except notices and deprecation messagesif (!defined('E_DEPRECATED')){define('E_DEPRECATED', 8192);}error_reporting(E_ALL ^ E_NOTICE ^ E_DEPRECATED);/** Remove variables created by register_globals from the global scope* Thanks to Matt Kavanagh* 删除全局变量函数*/function deregister_globals(){ //$not_unset = array('GLOBALS' => true,'_GET' => true,'_POST' => true,'_COOKIE' => true,'_REQUEST' => true,'_SERVER' => true,'_SESSION' => true,'_ENV' => true,'_FILES' => true,'phpEx' => true,'phpbb_root_path'=> true);// Not only will array_merge and array_keys give a warning if// a parameter is not an array, array_merge will actually fail.// So we check if _SESSION has been initialised.if (!isset($_SESSION) || !is_array($_SESSION)){$_SESSION = array();}// Merge all into one extremely huge array; unset this later/* * array_merge — 合并一个或多个数组 * array_keys — 返回数组中所有的键名 * 把$_GET等数组的键名合成一个数组 */$input = array_merge(array_keys($_GET),array_keys($_POST),array_keys($_COOKIE),array_keys($_SERVER),array_keys($_SESSION),array_keys($_ENV),array_keys($_FILES));foreach ($input as $varname){if (isset($not_unset[$varname])){// Hacking attempt. No point in continuing unless it's a COOKIEif ($varname !== 'GLOBALS' || isset($_GET['GLOBALS']) || isset($_POST['GLOBALS']) || isset($_SERVER['GLOBALS']) || isset($_SESSION['GLOBALS']) || isset($_ENV['GLOBALS']) || isset($_FILES['GLOBALS'])){exit;}else{$cookie = &$_COOKIE;while (isset($cookie['GLOBALS'])){foreach ($cookie['GLOBALS'] as $registered_var => $value){if (!isset($not_unset[$registered_var])){unset($GLOBALS[$registered_var]);}}$cookie = &$cookie['GLOBALS'];}}}unset($GLOBALS[$varname]);}unset($input);}// If we are on PHP >= 6.0.0 we do not need some code//检测PHP6if (version_compare(PHP_VERSION, '6.0.0-dev', '>=')){/*** @ignore*/define('STRIP', false);}else{//禁用PHP魔术方法@set_magic_quotes_runtime(0);// Be paranoid with passed vars/* * int_get() 取得php.ini中的值 * strtolower() 全部转化成小写 * function_exists() 检测函数是否定义 * 这里先用ini_get检测不知道效率是不是有些低？为什么不把!function_exists('ini_get')提到前面来呢？ */if (@ini_get('register_globals') == '1' || strtolower(@ini_get('register_globals')) == 'on' || !function_exists('ini_get')){deregister_globals();}//get_magic_quotes_gpc() 检测魔术方法是否启用，如果启用为1，否则为0define('STRIP', (get_magic_quotes_gpc()) ? true : false);}if (defined('IN_CRON')){//DIRECTORY_SEPARATOR PHP内置常量，路径分割符。win中为/，linux中为///dirname() 返回路径中的目录部分$phpbb_root_path = dirname(__FILE__) . DIRECTORY_SEPARATOR;}//如果没有找到config.php，提示重新安装if (!file_exists($phpbb_root_path . 'config.' . $phpEx)){die("<p>The config.$phpEx file could not be found.</p><p><a href="/" mce_href="/""{$phpbb_root_path}install/index.$phpEx/">Click here to install phpBB</a></p>");}require($phpbb_root_path . 'config.' . $phpEx);//PHPBB_INSTALLED 在config.php中定义if (!defined('PHPBB_INSTALLED')){/* * 作用：重定向到浏览器，并保证重定向后后续代码不被执行（exit） * 1、取得主机名 * 2、取得端口号 * 3、取得连接类型（是否为https） * 4、取得脚本路径，主要是为了判断是不是根目录 * 5、把/替换为/ * 6、组合成url(http头) */// Redirect the user to the installer//重新定义到用户安装// We have to generate a full HTTP/1.1 header here since we can't guarantee to have any of the information// available as used by the redirect function//getenv() 取得系统的环境变量，参数很多。//主机名$server_name = (!empty($_SERVER['HTTP_HOST'])) ? strtolower($_SERVER['HTTP_HOST']) : ((!empty($_SERVER['SERVER_NAME'])) ? $_SERVER['SERVER_NAME'] : getenv('SERVER_NAME'));//主机端口$server_port = (!empty($_SERVER['SERVER_PORT'])) ? (int) $_SERVER['SERVER_PORT'] : (int) getenv('SERVER_PORT');//安全链接$secure = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 1 : 0;//脚本名称这里为：/phpbb/index.php$script_name = (!empty($_SERVER['PHP_SELF'])) ? $_SERVER['PHP_SELF'] : getenv('PHP_SELF');//如果$script_name为空，!script_name也可以通过if (!$script_name){$script_name = (!empty($_SERVER['REQUEST_URI'])) ? $_SERVER['REQUEST_URI'] : getenv('REQUEST_URI');}// Replace any number of consecutive backslashes and/or slashes with a single slash//替换反斜线// (could happen on some proxy setups and/or Windows servers)//可能有一些代理设置，端口号不为80等/* * trim()函数从字符串的两端删除空白字符和其他预定义字符。 */$script_path = trim(dirname($script_name)) . '/install/index.' . $phpEx;$script_path = preg_replace('#[/////]{2,}#', '/', $script_path);$url = (($secure) ? 'https://' : 'http://') . $server_name;//设置端口，如果不是80.//strpos() 函数返回字符串在另一个字符串中第一次出现的位置。if ($server_port && (($secure && $server_port <> 443) || (!$secure && $server_port <> 80))){//如果主机后面没有:则证明没有添加端口号，这时可以为其添加端口// HTTP HOST can carry a port number...if (strpos($server_name, ':') === false){$url .= ':' . $server_port;}}$url .= $script_path;header('Location: ' . $url);exit;}if (defined('DEBUG_EXTRA')){$base_memory_usage = 0;//获得PHP脚本占用内存if (function_exists('memory_get_usage')){$base_memory_usage = memory_get_usage();}}// Load Extensions//负载扩展???// dl() is deprecated and disabled by default as of PHP 5.3.// dl() 已经废弃，在PHP 5.3中默认为关闭// 这段没有看明白if (!empty($load_extensions) && function_exists('dl')){$load_extensions = explode(',', $load_extensions);foreach ($load_extensions as $extension){@dl(trim($extension));}}//下面又要跳了，还是老规矩，跳到下面的第一个文件。// Include filesrequire($phpbb_root_path . 'includes/acm/acm_' . $acm_type . '.' . $phpEx);require($phpbb_root_path . 'includes/cache.' . $phpEx);require($phpbb_root_path . 'includes/template.' . $phpEx);require($phpbb_root_path . 'includes/session.' . $phpEx);require($phpbb_root_path . 'includes/auth.' . $phpEx);require($phpbb_root_path . 'includes/functions.' . $phpEx);require($phpbb_root_path . 'includes/functions_content.' . $phpEx);require($phpbb_root_path . 'includes/constants.' . $phpEx);require($phpbb_root_path . 'includes/db/' . $dbms . '.' . $phpEx);require($phpbb_root_path . 'includes/utf/utf_tools.' . $phpEx);// Set PHP error handler to oursset_error_handler(defined('PHPBB_MSG_HANDLER') ? PHPBB_MSG_HANDLER : 'msg_handler');// Instantiate some basic classes$user= new user();$auth= new auth();$template= new template();$cache= new cache();$db= new $sql_db();// Connect to DB$db->sql_connect($dbhost, $dbuser, $dbpasswd, $dbname, $dbport, false, defined('PHPBB_DB_NEW_LINK') ? PHPBB_DB_NEW_LINK : false);// We do not need this any longer, unset for safety purposesunset($dbpasswd);// Grab global variables, re-cache if necessary$config = $cache->obtain_config();// Add own hook handlerrequire($phpbb_root_path . 'includes/hooks/index.' . $phpEx);$phpbb_hook = new phpbb_hook(array('exit_handler', 'phpbb_user_session_handler', 'append_sid', array('template', 'display')));foreach ($cache->obtain_hooks() as $hook){@include($phpbb_root_path . 'includes/hooks/' . $hook . '.' . $phpEx);}?>