如何获取其他目录分支中的文件？
当我尝试使用 require 或 require_once 时，如果所需的文件位于同一子目录中，但当它看到子目录之外的文件时，它会正常工作，它会产生致命错误。文件树基本上是这样的：
* main.php
+ login/
* login.php
+ includes/
* session.php
...所以基本上，如果我让 main.php 需要 login/login.php，那很好，但是如果我尝试对 login.php 进行目录遍历以要求 include/ session.php 失败，导致错误：
PHP Fatal error: require_once(): Failed opening required [...]
这个概念的代码是：
require('login/login.php') #works fine (main.php)
require('../includes/session.php') #quits (login.php)
我尝试使用 $_SERVER('DOCUMENT_ROOT')、$_SERVER('SERVER_ADDR')、dir(_FILE_) 和 chdir(../)。我记得几个月前我在一个项目上解决了这个问题，这是一个遍历文件路径的简单函数，但我再也找不到它了。有什么想法吗？
When I try to use require or require_once, it will work fine if the file to be required is in the same subdirectory, but the moment it sees a file outside of their subdirectory, it generates a fatal error. Here is basically what the file tree looks like:
* main.php
+ login/
* login.php
+ includes/
* session.php
...so basically, if I were to have main.php require login/login.php, it's fine, but if I try to do directory traversal for login.php to require includes/session.php, it fails, resulting in the error:
PHP Fatal error: require_once(): Failed opening required [...]
The code for this concept would be:
require('login/login.php') #works fine (main.php)
require('../includes/session.php') #quits (login.php)
I have tried using $_SERVER('DOCUMENT_ROOT'), $_SERVER('SERVER_ADDR'), dir(_FILE_), and chdir(../). I remember working on a project a few months back that I solved this problem on, it was a simple function that traversed file paths, but I can't find it anymore. Any ideas?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
使用
set_include_path()，它会让你的生活变得更轻松。Use
set_include_path(), it'll make your life much easier.这不是递归，它只是简单的旧目录遍历。
切勿对 include/require 使用相对路径。您永远不知道您的脚本是从哪个目录调用的，因此您总是有可能位于错误的工作目录中。这只是头痛的良方。
始终使用 dirname(__FILE__) 来获取当前文件所在目录的绝对路径。如果您使用的是 PHP 5.3，则只需执行
__DIR__即可。 （注意前后两个下划线。）（顺便说一句，您不需要在 include/require 两边加上括号，因为它是一种语言构造，而不是函数。）
使用绝对路径也可能具有更好的性能，因为 PHP 不需要查看
include_path中的每个目录。 （但这仅适用于include_path中有多个目录的情况。）This ain't recursion, it's just plain old directory traversal.
NEVER use relative paths for include/require. You never know from which directory your script was invoked, so there's always a possibility that you'll be in the wrong working directory. This is just a recipe for headaches.
ALWAYS use
dirname(__FILE__)to get the absolute path of the directory where the current file is located. If you're on PHP 5.3, you can just do__DIR__. (Notice two underscores front and back.)(By the way, you don't need parentheses around include/require because it's a language construct, not a function.)
Using absolute paths might also have better performance because PHP doesn't need to look into each and every directory in
include_path. (But this only applies if you have several directories in yourinclude_path.)