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$_SERVER['PATH']值的有关问题

Jun 13, 2016 pm 01:29 PM
apache path php shell

$_SERVER['PATH']值的问题
大家好。
我有两个文件一个是phpinfo.php 里面只有 

PHP code
<!--

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--> phpinfo();?>
Copy after login


另外一个文件是 test.php 里面只有
PHP code
<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--> echo $_SERVER['PATH'];?>
Copy after login


在命令行下面,我用phpinfo页面里的 User/Group 的用户名 登陆
执行php test.php 

输出的path 和 和在浏览器里运行http://localhost/test.php 输出的path 
内容部一致,有人知道原因么?

明明是同一个用户名一个在命令行下执行,一个用webpage 执行
区别就是一个通过apache,一个没有,但是我也是用的apache 的httpd.conf里的用户名啊。
为什么输出的path不一致呢。
请大家帮忙看下,谢谢!!


------解决方案--------------------
$_SERVER['PATH']
是操作系统环境变量 PATH 的值,同一台机器自然是一样的
------解决方案--------------------
没看懂,phpinfo里面的user/group是说apache运行的有效用户ID和有效用户组ID?

哦。

你一个是apache访问,一个是切成apache用户,然后Php执行,对吗?

当然不同,因为apache是root启动绑80端口的,root用户的PATH是带sbin路径的,绑完80就切成user/group了,但是你要知道环境变量是从shell继承下来的,而shell的环境变量是根据启动apache进程的用户决定的,而你启动apache的用户是root,root的shell进程环境变量是带sbin的,所以启动的apache进程继承shell环境变量,也是带sbin的,apache里bind之后setuid不会改变进程环境变量了。

而你直接以user/group执行php,道理就很明显了, 普通用户的shell进程没有sbin的PATH,所以php解释器进程也就没有sbin的PATH环境变量了。
------解决方案--------------------
“PATH_TRANSLATED” 
当前脚本所在文件系统(不是文档根目录)的基本路径。这是在服务器进行虚拟到真实路径的映像后的结果。

注意: PHP 4.3.2 之后,PATH_TRANSLATED 在 Apache 2 SAPI 模式下不再和 Apache 1 一样隐含赋值,而是若 Apache 不生成此值,PHP 便自己生成并将其值放入 SCRIPT_FILENAME 服务器常量中。这个修改遵守了 CGI 规范,PATH_TRANSLATED 仅在 PATH_INFO 被定义的条件下才存在。

Apache 2 用户可以使用 httpd.conf 中的 AcceptPathInfo On 来定义 PATH_INFO。

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