相对路径：向下和向上 [英] Relative paths : going down and up

问题描述

我有一堆目录，但我遇到包含一些文件的问题。这是我的结构。

I have a bunch of directories, and I have trouble including some files. Here's my structure.

index.php

index.php

vian / vian.php

vian/vian.php

包含/ overall / head_content.php

includes/overall/head_content.php

包含/ overall / head.php

includes/overall/head.php

这是我的 head_content.php 。

testing text
<?php include 'includes/overall/head.php'; ?>
<div class="wrapper row3">
    <div id="container" class="clear"> 
        <div id="content">

我想将该文件包含在 vian / vian.php

我使用'../ includes / overall / head_content.php'; ，以及路径有效，因为测试文本出现了。但它不能包含 includes / overall / head.php 。我模糊地理解为什么它不起作用，但我无法弄清楚如何解决它。

I use '../includes/overall/head_content.php';, and the path works since 'testing text' shows up. But it cannot include includes/overall/head.php. I vaguely understand why it doesn't work, but I can't figure out how to fix it.

'../ includes / overall / head_content.php'; 用于我的所有页面，包括 index.php ，位于我的根目录中。

'../includes/overall/head_content.php'; is used on all my pages, including index.php, which is in my root directory.

推荐答案

在你的结构中：

 + index.php
 + vian
 |  ` vian.php
 ` includes
    + overall
        + head_content.php
        ` head.php

每个文件与另一个文件都有特定的关系。因此，您可以使用从一个文件到另一个文件的相对链接。

Each file has a specific relationship to the other. Because of that you can make use of relative links from one file to another.

PHP的帮助就是 __ DIR __ 魔力常数。它自动包含每个文件中的目录。您可以使用它，使相对路径成为绝对路径。绝对路径非常强大。

Of help in PHP for that is the __DIR__ magic constant. It contains the directory in each file automatically. You can use it, to make the relative path an absolute one. Absolute paths are very robust.

示例：

• 来自 index .php 到包含/ overall / head.php ：
  
  __ DIR__。 '/includes/overall/head.php'


• 从包含/ overall / head.php 到 vian / vian .php ：
  
  __ DIR__。 '/../../ vian / vian.php'


• 从包含/ overall / head_content.php 到 includes / overall / head.php ：
  
  __ DIR__。 '/head.php'

• From index.php to includes/overall/head.php:
  __DIR__ . '/includes/overall/head.php'
• From includes/overall/head.php to vian/vian.php:
  __DIR__ . '/../../vian/vian.php'
• From includes/overall/head_content.php to includes/overall/head.php:
  __DIR__ . '/head.php'

依此类推。

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