PHP 包含根目录中的所有文件（如 CMS）

Question

I need to create subfolders with their own index.php files inside them for my pages. When I include the header and footer files in the root directory, however, the site breaks because the header file is looking for all the CSS and JavaScript files in the current directory.

How can I fix this?

Answer 1

You can use relative paths in the include, and .. to go up a directory.

include('../functions.php');

This will include functions.php from the parent folder. If it were 2 folders deep, it would be ../../functions.php

This is the most common way of including things in other folders, actually providing a relative yet direct path. Using the parsers include_path can work but is not as portable.

Just a quick comparison of the execution plan of both approaches:

Using include('../functions.php'); :

Check parent folder, open functions.php

Using include_path, lets say only 3 paths in list, and include('functions.php');

Check current folder, file does not exist

Check first path in include_path, file does not exist

Check second path in include_path, file does not exist

Check third path in include_path, open functions.php

Then you have to hope that someone doesn't put a functions.php in one of those other included paths...

Answer 2

For the server side, add the root to your include_path setting (or, if you don't intend to include from anywhere else, replace the include_path with the root), and you'll be able to refer to the files in it from anywhere.

Client-side, you'd use the <base> tag to tell a browser where URLs start from (ie: where relative URLs end up pointing to). You only really need this if you're linking the CSS and JS rather than including them, but that's the more common scenario. (You'd usually include PHP, and link CSS/JS.)