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谁能说明一下discuz X2.5 upload/index.php文件思路

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Release: 2016-06-13 11:37:43
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哪位高手能说明一下discuz X2.5 upload/index.php文件思路!
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!!!

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