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HomeBackend DevelopmentPHP Tutorial遇到一个文件路径的有关问题,求教

遇到一个文件路径的问题,求教。
遇到了和该帖楼主一样的问题http://hi.baidu.com/linywh/item/1ae8ac335f0d4ef8e6bb7a73

我的项目文件夹结构是这样的<br /><br />|――images<br />|――include<br />&nbsp |――class<br />&nbsp |――config<br />&nbsp |――function<br />|――index.php<br />在config文件夹中有一个配置文件config.php class文件夹中有一个文件mysql.class.php   我在        config.php中使用require_once("../class/mysql.class.php");<br />而后我 又在index.php中使用require_once ("include/config/config.php");<br />这时它就提示我错误<br /><br />Warning: require_once(../class/mysql.class.php) [function.require-once]: failed to open stream: No such file or directory in E:\www\blog\include\config\config.php on line 13<br /><br />Fatal error: require_once() [function.require]: Failed opening required '../class/mysql.class.php' (include_path='.;C:\php5\pear') in E:\www\blog\include\config\config.php on line 13<br />照常向我这样的初学者、小菜鸟有百度谷歌逛了一下,找了一个方法dirname(__FILE__)用来获得当前文件夹的绝对路径.和dirname()的嵌套使用dirname(dirname(__FILE__))获得上一层目录于是我就改了我config.phpd require_once语句<br />改为require_once(dirname(dirname(__FILE__))."../class/mysql.class.php");<br />接着在index.php中引用config.php就不会出现错误


我按照那个帖子的方法做了,问题解决了,但是我还是不能理解为什么不出错了?在我这,这两个文件路径输出出来分别是这样的:
D:\web\graduatesManagement../class/Database.class.php
D:\web../class/Database.class.php
这两个路径实在是看不懂,求各位帮忙解答一下,谢过。

文件路径
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