PHP中的绝对（或相对？）路径 [英] Absolute (or relative?) path in PHP

问题描述

很抱歉，因为它之前可能会被多次回答，但我的问题有点不同

Sorry for asking it as it may be answered many times before, but my question is little bit different

我喜欢树

/var/www/path/to/my/app/
   -- index.php
   -- b.php
   -- inc/
      -- include.php

（我正在访问公司/ index.php中的include.php，

(I'm accessing inc/include.php from index.php,

include "inc/include.php";

）

但是在include.php中，我需要获得APPLICATION的绝对路径root，而不是DOCUMENT_ROOT
所以结果，我需要能够使用这个命令

but in include.php, I need to get absolute path to APPLICATION root, not DOCUMENT_ROOT so in result, I need to be able to use this command

//inc/include.php
include(APP_ROOT."/b.php");

重复，我不想打电话

include("../b.php");

是否有原生功能，如果可能的话？

is there native function, if possible?

我想通过PHP获取PATH，因为任何开源需要有这个路径检测
为什么？如果我想从ajax / 1 / somethiing.php中包含inc / include.php，那么成功但inc / include.php会尝试包含ajax / b.php而不是b.php

I am wanting to get PATH by PHP as any open source need to have this path detection why? If I would want to include inc/include.php from ajax/1/somethiing.php, it success but inc/include.php then tries to include ajax/b.php instead of b.php

我有这棵树

-- index.php
-- b.php
-- inc/
    -- include.php
-- ajax/
    -- 1/
       -- ajax.php

现在看。从index.php，您将调用inc / include.php

Now look. From index.php, you'll call inc/include.php

include("inc/include.php"); //included file

现在，包含文件搜索

include("../b.php");

它会起作用，但是！如果我从ajax / 1 / ajax.php调用include of inc / include.php，就像这样

It will work, but! If I would call include of inc/include.php from ajax/1/ajax.php, like this

include("../../inc/include.php");

它会起作用，但包含的文件会尝试包含

it will work, but included file will try to include

../b.php 

../../b.php的路径是相对于包含inc / include.php
得到它的文件？

instead of ../../b.php as path is relative to file which INCLUDED that inc/include.php Got it ?

推荐答案

是否有原生函数，如果可能的话？

is there native function, if possible?

no。文档根是您可以从PHP获得的唯一内容。 （但请注意，在您的方案中，您只需调用 include（b.php）; ，因为脚本仍在index.php的上下文中。）

no. The document root is the only thing you can get from PHP. (Note however that in your scenario, you can simply call include("b.php"); because the script is still in the context of index.php.)

重新更新：

您可以在中央配置中定义全局应用程序根目录文件。假设您的应用根目录中有 config.php 。然后做一个

You can define a global application root in a central configuration file. Say you have config.php in your app root. Then do a

define("APP_ROOT", dirname(__FILE__));

你仍然必须包含配置文件，你必须使用它的相对路径，例如

you still have to include the config file, and you have to use relative paths for it, e.g.

include ("../../../config.php");

但是一旦你这样做了，你可以相对于脚本中的app root工作：

but once you have done that, you can work relative to the app root inside the script:

include (APP_ROOT."/b.php");  <--  Will always return the correct path

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