destoon代码从头到尾捋一遍

destoon® B2B网站管理系统(以下简称destoon)由西安嘉客信息科技有限责任公司独立研发并推出，对其拥有完全知识产权，中国国家版权局计算机软件著作权登记号：2009SR037570。
系统使用当前流行的PHP语言开发，以MySQL为数据库，采用B/S架构，MVC模式开发。融入了模型化、模板、缓存、AJAX、SEO等前沿技术。与同类产品相比，系统功能更加强大、使用更加简单、运行更加稳定、安全性更强，效率更高，用户体验更好。系统开源发布，便于二次开发、功能整合、个性修改。
代码首先包含common.inc.php文件
在common.inc.php文件中，首先定义常量。
define('IN_DESTOON', true);
define('IN_ADMIN', defined('DT_ADMIN') ? true : false);
define('DT_ROOT', str_replace("\\", '/', dirname(__FILE__)));
if(defined('DT_REWRITE')) include DT_ROOT.'/include/rewrite.inc.php';//是否定义了url伪静态？
$CFG = array();//网站整体配置信息
require DT_ROOT.'/config.inc.php';//-----------------网站配置文件
define('DT_PATH', $CFG['url']);
define('DT_DOMAIN', $CFG['cookie_domain'] ? substr($CFG['cookie_domain'], 1) : '');
define('DT_WIN', strpos(strtoupper(PHP_OS), 'WIN') !== false ? true: false);
define('DT_CHMOD', ($CFG['file_mod'] && !DT_WIN) ? $CFG['file_mod'] : 0);
define('DT_URL', $CFG['url']);//Fox 3.x
define('DT_LANG', $CFG['language']);
define('DT_KEY', $CFG['authkey']);
define('DT_CHARSET', $CFG['charset']);
define('DT_CACHE', $CFG['cache_dir'] ? $CFG['cache_dir'] : DT_ROOT.'/file/cache');
define('DT_SKIN', DT_PATH.'skin/'.$CFG['skin'].'/');
define('SKIN_PATH', DT_PATH.'skin/'.$CFG['skin'].'/');//For 2.x
define('VIP', $CFG['com_vip']);
define('errmsg', 'Invalid Request');
随后加载网站基本功能
$L = array();
include DT_ROOT.'/lang/'.DT_LANG.'/lang.inc.php';//语言信息
require DT_ROOT.'/version.inc.php';
require DT_ROOT.'/include/global.func.php';//--------全局函数
require DT_ROOT.'/include/tag.func.php';//-----------标签函数
require DT_ROOT.'/api/im.func.php';//----------------聊天工具
require DT_ROOT.'/api/extend.func.php';//------------自己写的扩展函数
if(!$MQG && $_POST) $_POST = daddslashes($_POST);
if(!$MQG && $_GET) $_GET = daddslashes($_GET);
if(function_exists('date_default_timezone_set')) date_default_timezone_set($CFG['timezone']);
$DT_PRE = $CFG['tb_pre'];
$DT_QST = $_SERVER['QUERY_STRING'];//----------------querystring
$DT_TIME = time() + $CFG['timediff'];//--------------当前时间
$DT_IP = get_env('ip');
$DT_URL = get_env('url');
$DT_REF = get_env('referer');
$DT_BOT = is_robot();
链接数据库，建立缓存。
header("Content-Type:text/html;charset=".DT_CHARSET);
require DT_ROOT.'/include/db_'.$CFG['database'].'.class.php';//加载数据库类
require DT_ROOT.'/include/cache_'.$CFG['cache'].'.class.php';//加载缓存类
if($_POST) extract($_POST, EXTR_SKIP);//解析post请求的数据
if($_GET) extract($_GET, EXTR_SKIP);//解析get请求的数据
$db_class = 'db_'.$CFG['database'];
$db = new $db_class;
$db->halt = (DT_DEBUG || IN_ADMIN) ? 1 : 0;
$db->pre = $CFG['tb_pre'];
$db->connect($CFG['db_host'], $CFG['db_user'], $CFG['db_pass'], $CFG['db_name'], $CFG['db_expires'], $CFG['db_charset'], $CFG['pconnect']);
$dc = new dcache();
$dc->pre = $CFG['cache_pre'];
加载模块的基本配置
$DT = $MOD = $EXT = $CSS = $DTMP = $CAT = $ARE = $AREA = array();
$CACHE = cache_read('module.php');
if(!$CACHE) {
//没有缓存模块，就读取缓存模块。
require_once DT_ROOT.'/admin/global.func.php';
require_once DT_ROOT.'/include/post.func.php';
require_once DT_ROOT.'/include/cache.func.php';
    cache_all();
$CACHE = cache_read('module.php');
}
$DT = $CACHE['dt'];
$MODULE = $CACHE['module'];
$EXT = cache_read('module-3.php');
加载模块，读取模块信息，引入模块文件
if(!isset($moduleid)) {
$moduleid = 1;
$module = 'destoon';
} else if($moduleid == 1) {
$module = 'destoon';
} else {
$moduleid = intval($moduleid);
isset($MODULE[$moduleid]) or dheader(DT_PATH);
$module = $MODULE[$moduleid]['module'];
$MOD = $moduleid == 3 ? $EXT : cache_read('module-'.$moduleid.'.php');
include DT_ROOT.'/lang/'.DT_LANG.'/'.$module.'.inc.php';
}
$forward = isset($forward) ? urldecode($forward) : $DT_REF;//------------来源页面
$action = isset($action) ? trim($action) : '';//-------------动作指令
//判断用户登录
$destoon_auth = get_cookie('auth');
if($destoon_auth) {
$_dauth = explode("\t", decrypt($destoon_auth, md5(DT_KEY.$_SERVER['HTTP_USER_AGENT'])));
//print_r($_dauth);SELECT userid,username,groupid,admin FROM destoon_member
$_userid = isset($_dauth[0]) ? intval($_dauth[0]) : 0;
$_username = isset($_dauth[1]) ? trim($_dauth[1]) : '';
$_groupid = isset($_dauth[2]) ? intval($_dauth[2]) : 3;
$_admin = isset($_dauth[4]) ? intval($_dauth[4]) : 0;
if($_userid && !defined('DT_NONUSER')) {
$_password = isset($_dauth[3]) ? trim($_dauth[3]) : '';
$user = $db->get_one("SELECT username,passport,company,truename,password,groupid,email,message,chat,sound,online,sms,credit,money,loginip,admin,aid,edittime,trade FROM {$DT_PRE}member WHERE userid=$_userid");
if($user && $user['password'] == $_password) {
if($user['groupid'] == 2) dalert(lang('message->common_forbidden'));//禁止用户访问的组别
extract($user, EXTR_PREFIX_ALL, '');
if($user['loginip'] != $DT_IP && ($DT['ip_login'] == 2 || ($DT['ip_login'] == 1 && IN_ADMIN))) {
//单点登录，判断ip
$_userid = 0; set_cookie('auth', '');
dalert(lang('message->common_login', array($user['loginip'])), DT_PATH);
}
} else {
//登录失败
$_userid = 0;
if($db->linked && !isset($swfupload) && strpos($_SERVER['HTTP_USER_AGENT'], 'Flash') === false) set_cookie('auth', '');
}
unset($destoon_auth, $user, $_dauth, $_password);
}
}

if($_userid == 0) { $_groupid = 3; $_username = ''; }
if(!IN_ADMIN) {
if($_groupid == 1) include DT_ROOT.'/module/member/admin.inc.php';
if($_userid && !defined('DT_NONUSER')) {
$db->query("REPLACE INTO {$DT_PRE}online (userid,username,ip,moduleid,online,lasttime) VALUES ('$_userid','$_username','$DT_IP','$moduleid','$_online','$DT_TIME')");
} 
else {
if(timetodate($DT_TIME, 'i') == 10) {
$lastime = $DT_TIME - $DT['online'];
$db->query("DELETE FROM {$DT_PRE}online WHERE lasttime<$lastime");
}
}
}
$MG = cache_read('group-'.$_groupid.'.php');//读取用户组别配置
$_areaids = '';
$_areaid = array();
if($DT['city']) {
$AREA or $AREA = cache_read('area.php');
if($_aid) {
$_areaids = $AREA[$_aid]['child'] ? $AREA[$_aid]['arrchildid'] : $_aid;
$_areaid = explode(',', $_areaids);
}
} else {
$_aid < 1 or dalert('系统未开启分站功能，您的分站管理帐号暂不可用', $MODULE[2]['linkurl'].'logout.php');
}
$session = new dsession();
require DT_ROOT.'/admin/global.func.php';
require DT_ROOT.'/include/post.func.php';
require_once DT_ROOT.'/include/cache.func.php';
isset($file) or $file = 'index';
$secretkey = 'admin_'.strtolower(substr($CFG['authkey'], -6));
//echo $secretkey;exit;
if($DT['authadmin'] == 'session') {
$_destoon_admin = isset($_SESSION[$secretkey]) ? intval($_SESSION[$secretkey]) : 0;
} else {
$_destoon_admin = get_cookie($secretkey);
$_destoon_admin = $_destoon_admin ? intval($_destoon_admin) : 0;
}
$_founder = $CFG['founderid'] == $_userid ? $_userid : 0;
$_catids = $_childs = '';
$_catid = $_child = array();
if($file != 'login') {
if($_groupid != 1 || $_admin < 1 || !$_destoon_admin) msg('', '?file=login&forward='.urlencode($DT_URL));
//判断用户是否已经登录？如果未登录，直接跳转到登录页面。防止用户构造url。
if(!admin_check()) {
admin_log(1);
$db->query("DELETE FROM {$db->pre}admin WHERE userid=$_userid AND url='?".$DT_QST."'");
msg('警告！您无权进行此操作 Error(00)');
}
}
//是否记录日志
if($DT['admin_log'] && $action != 'import') admin_log();
if($DT['admin_online']) admin_online();
$psize = isset($psize) ? intval($psize) : 0;
if($psize > 0 && $psize != $pagesize) {
$pagesize = $psize;
$offset = ($page-1)*$pagesize;
}

if($module == 'destoon') {

(include DT_ROOT.'/admin/'.$file.'.inc.php') or msg();
} else {
echo $file.'|'.$module;
include DT_ROOT.'/module/'.$module.'/common.inc.php';//加载模块下的common文件
(include MD_ROOT.'/admin/'.$file.'.inc.php') or msg();//加载模块文件
}