哪位高手能说明一下discuz X2.5 upload/index.php文件思路！

discuz

discuz X2.5 upload/index.php代码如下，主说针对运行步骤（架构思路）说明一下，越详细越好，非常感谢！！！

<?php/** *      [Discuz!] (C)2001-2099 Comsenz Inc. *      This is NOT a freeware, use is subject to license terms * *      $Id: index.php 27617 2012-02-07 08:24:14Z monkey $ */if(!empty($_SERVER['QUERY_STRING']) && is_numeric($_SERVER['QUERY_STRING'])) {	$_ENV['curapp'] = 'home';	$_GET = array('mod'=>'space', 'uid'=>$_SERVER['QUERY_STRING']);} else {	$url = '';	$domain = $_ENV = array();	$jump = false;	@include_once './data/sysdata/cache_domain.php';	$_ENV['domain'] = $domain;	if(empty($_ENV['domain'])) {		$_ENV['curapp'] = 'forum';	} else {		$_ENV['defaultapp'] = array('portal.php' => 'portal', 'forum.php' => 'forum', 'group.php' => 'group', 'home.php' => 'home');		$_ENV['hostarr'] = explode('.', $_SERVER['HTTP_HOST']);		$_ENV['domainroot'] = substr($_SERVER['HTTP_HOST'], strpos($_SERVER['HTTP_HOST'], '.')+1);		if(!empty($_ENV['domain']['app']) && is_array($_ENV['domain']['app']) && in_array($_SERVER['HTTP_HOST'], $_ENV['domain']['app'])) {			$_ENV['curapp'] = array_search($_SERVER['HTTP_HOST'], $_ENV['domain']['app']);			if($_ENV['curapp'] == 'mobile') {				$_ENV['curapp'] = 'forum';				if(@$_GET['mobile'] != 'no') {					@$_GET['mobile'] = 'yes';				}			}			if($_ENV['curapp'] == 'default' || !isset($_ENV['defaultapp'][$_ENV['curapp'].'.php'])) {				$_ENV['curapp'] = '';			}		} elseif(!empty($_ENV['domain']['root']) && is_array($_ENV['domain']['root']) && in_array($_ENV['domainroot'], $_ENV['domain']['root'])) {			$_G['setting']['holddomain'] = $_ENV['domain']['holddomain'] ? $_ENV['domain']['holddomain'] : array('www');			$list = $_ENV['domain']['list'];			if(isset($list[$_SERVER['HTTP_HOST']])) {				$domain = $list[$_SERVER['HTTP_HOST']];				$id = intval($domain['id']);				switch($domain['idtype']) {					case 'subarea':						$_ENV['curapp'] = 'forum';						$_GET['gid'] = $id;						break;					case 'forum':						$_ENV['curapp'] = 'forum';						$_GET['mod'] = 'forumdisplay';						$_GET['fid'] = $id;						break;					case 'topic':						$_ENV['curapp'] = 'portal';						$_GET['mod'] = 'topic';						$_GET['topicid'] = $id;						break;					case 'channel':						$_ENV['curapp'] = 'portal';						$_GET['mod'] = 'list';						$_GET['catid'] = $id;						break;				}			} elseif(count($_ENV['hostarr']) > 2 && $_ENV['hostarr'][0] != 'www' && !checkholddomain($_ENV['hostarr'][0])) {				$_ENV['prefixdomain'] = addslashes($_ENV['hostarr'][0]);				$_ENV['domainroot'] = addslashes($_ENV['domainroot']);				require_once './source/class/class_core.php';				C::app()->init_setting = true;				C::app()->init_user = false;				C::app()->init_session = false;				C::app()->init_cron = false;				C::app()->init_misc = false;				C::app()->init();				$jump = true;				$domain = C::t('common_domain')->fetch_by_domain_domainroot($_ENV['prefixdomain'], $_ENV['domainroot']);				$apphost = $_ENV['domain'][<p>4本文￥来源gao!%daima.com搞$代*!码$网9</p><pre>搞代gaodaima码

‘app’][$domain[‘idtype’]] ? $_ENV[‘domain’][‘app’][$domain[‘idtype’]] : $_ENV[‘domain’][‘app’][‘default’]; $apphost = $apphost ? ‘http://’.$apphost.’/’ : ”; switch($domain[‘idtype’]) { case ‘home’: if($_G[‘setting’][‘rewritestatus’] && in_array(‘home_space’, $_G[‘setting’][‘rewritestatus’])) { $url = rewriteoutput(‘home_space’, 1, $apphost, $domain[‘id’]); } else { $url = $apphost.’home.php?mod=space&uid=’.$domain[‘id’]; } break; case ‘group’: if($_G[‘setting’][‘rewritestatus’] && in_array(‘group_group’, $_G[‘setting’][‘rewritestatus’])) { $url = rewriteoutput(‘group_group’, 1, $apphost, $domain[‘id’]); } else { $url = $apphost.’forum.php?mod=group&fid=’.$domain[‘id’].’&page=1′; } break; } } } else { $jump = true; } if(empty($url) && empty($_ENV[‘curapp’])) { if(!empty($_ENV[‘domain’][‘defaultindex’]) && !$jump) { if($_ENV[‘defaultapp’][$_ENV[‘domain’][‘defaultindex’]]) { $_ENV[‘curapp’] = $_ENV[‘defaultapp’][$_ENV[‘domain’][‘defaultindex’]]; } else { $url = $_ENV[‘domain’][‘defaultindex’]; } } else { if($jump) { $url = empty($_ENV[‘domain’][‘app’][‘default’]) ? (!empty($_ENV[‘domain’][‘defaultindex’]) ? $_ENV[‘domain’][‘defaultindex’] : ‘forum.php’) : ‘http://’.$_ENV[‘domain’][‘app’][‘default’]; } else { $_ENV[‘curapp’] = ‘forum’; } } } }}if(!empty($url)) { $delimiter = strrpos($url, ‘?’) ? ‘&’ : ‘?’; if(isset($_GET[‘fromuid’]) && $_GET[‘fromuid’]) { $url .= $delimiter.’fromuid=’.$_GET[‘fromuid’]; } elseif(isset($_GET[‘fromuser’]) && $_GET[‘fromuser’]) { $url .= $delimiter.’fromuser=’.$_GET[‘fromuser’]; } header(“HTTP/1.1 301 Moved Permanently”); header(“location: $url”);} else { require ‘./’.$_ENV[‘curapp’].’.php’;}function checkholddomain($domain) { global $_G; $domain = strtolower($domain); if(preg_match(“/^[^a-z]/i”, $domain)) return true; $holdmainarr = empty($_G[‘setting’][‘holddomain’]) ? array(‘www’) : explode(‘|’, $_G[‘setting’][‘holddomain’]); $ishold = false; foreach ($holdmainarr as $value) { if(strpos($value, ‘*’) === false) { if(strtolower($value) == $domain) { $ishold = true; break; } } else { $value = str_replace(‘*’, ‘.*?’, $value); if(@preg_match(“/$value/i”, $domain)) { $ishold = true; break; } } } return $ishold;}?>

回复讨论(解决方案)

$_ENV[‘curapp’] = ‘home’; 不知道是什么意思

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