php访问根目录有问题？
我用的系统是CentOS，网站根目录是/var/www/html，根目录放有head.inc.php，当我在index.php里require('head.inc.php')时一切正常，require('./head.inc.php')时也正常，就是require('/head.inc.php')时候发现failed to open stream: No such file or directory的错误
前面的斜杠代表的是根目录，难道我设置有误？Apache的DocumentRoot和Directory都设置成了/var/www/html，www,html和文件都设置成了rwxr-xr-x,还有其他需要设置的吗？谢谢！
回复讨论(解决方案)
require('/head.inc.php') 指 /var/www/html/head.inc.php 也就是php认为head.inc.php是一个在html路径下的目录，而不是一个php文件。
或者你可以这样写：require(dirname(__FILE__).'/head.inc.php')
require 使用的是文件系统的路径而不是 web 的路径
谢谢changjay和xuzuning，但是dirname(__FILE__)获取的是当前文件的路径吧？我要获取根目录，例如有个子目录文件/var/www/html/report/index.php同样也要reqire根目录下的head.inc.php，如果用dirname(__FILE__)的话，就变成了require '/var/www/html/report/head.inc.php'
版主提到的是文件系统的路径，我想可能是这个原因，我试下改成/var/www/html/head.inc.php
是不是你这个网站节点的根目录没配置好！
版主，我试着改成了文件系统目录，可以了
zmzkkk，我已经把Apache的DocumentRoot和Directory都设置成了/var/www/html，还有其他要修改的吗？
网上说用/就表示根目录，好像include也是按文件系统目录的，这个问题google了半天也很少人提及
大家还有什么更好的解决办法？晚上结贴
是的 / 表示根目录
既然你的在做网站，那么你就不得不面对两个系统，也就是有两个根
网站的文件存放在操作系统的文件系统中， /var/www/html， /是文件系统的根
浏览器访问的是 http://localhost /index.php， /是 web 系统的根
web 系统的根是由你在 web 服务器中指定的，如
DocumentRoot = /var/www/html
其实 php 已经给出了解决方案：include_path
谢谢changjay和xuzuning，但是dirname(__FILE__)获取的是当前文件的路径吧？我要获取根目录，例如有个子目录文件/var/www/html/report/index.php同样也要reqire根目录下的head.inc.php，如果用dirname(__FILE__)的话，就变成了require '/var/www/html/report/head.inc.php'
版主提到的是文件系统的路径，我想可能是这个原因，我试下改成/var/www/html/head.inc.php
如果有配置文件的话，可以在配置文件里先把网站根目录赋值给一个变量，然后在需要的地方使用。
谢谢版主，但是我改了/etc/php.ini的include_path=".:/var/www/html",还是会出现:
Fatal error: require() [function.require]: Failed opening required '/head.inc.php' (include_path='.:/var/www/html') in xxx
我改后重启了linux,确认var,www,html以及html下面所有文件都是755,关闭了SeLinux(getenforce=permissive),但是还是错误。改成了你说的require('/var/www/html/head.inc.php')就可以，我再查查
Novolee，我也想过一个全局变量，但是绝对路径还是会泄露到php代码里
发现还有个变量$_SERVER['DOCUMENT_ROOT']，我用这个变量替代/又可以了
就是直接用/为什么还不可以
发现还有个变量$_SERVER['DOCUMENT_ROOT']，我用这个变量替代/又可以了
就是直接用/为什么还不可以
接受??及大?的做法: 使用你最早的方式 ./ 除非你的是打算在命令行下?行的?本那麽就??路??全.
发现还有个变量$_SERVER['DOCUMENT_ROOT']，我用这个变量替代/又可以了
就是直接用/为什么还不可以
前面不是有人回答了吗？直接用/，表示的是操作系统文件系统的根目录，而不是站点的根目录。
PhpNewnew，我的网页有好几层，但是header.inc.php,css样式表全部放在根目录里，所以直接用根目录加载这些会方便很多。./只能读取到当前目录
Novolee，是，但是php里就必须写成/var/www/html/head.inc.php了，有点担心这样的路径会不会不小心显示到网页里，所以还是用'DOCUMENT_ROOT了
谢谢大家，结贴
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