How can HTML “link href” call same file from different folders?

问题

Here is my root folder :

index.php
stylesheets(folder) --->main.css
includes(folder)    --->header.php
folder1  (folder)           --->page1.php

Here is link part of "header.php" (from includes folder) :

<link href="stylesheets/main.css" rel="stylesheet" type="text/css" />

Here is a part of index.php :

<?php include "includes/header.php"; ?>

Here is a part of page1.php (from folder1):

<?php include "../includes/header.php"; ?>

Problem is, when I open index.php everything is normal. As for /folder1/page1.php, it doesn't see styles but see content of header.php. That is to say, it doesn't bring main.css. Most probably, because of link href="stylesheets/main.css" rel="stylesheet" type="text/css" Any help?

回答1:

Because you access files from multiple levels, you should use an absolute path.

So either href="http://domain.com/stylesheets/main.css" or href="/stylesheets/main.css"

But this only works (the 2nd one, and the one I recommend) when you have it on top level on your domain.

回答2:

A robust solution is to use absolute links. A convenient way to do this is using a central configuration file. For instance, create a file config.php, containing

<?php

    define('SITE_ROOT', 'http://www.yourdomain.com/');

?>

And include this file in each PHP file (require_once('config.php');). Then you can write

<link href="<?php echo SITE_ROOT; ?>stylesheets/main.css" rel="stylesheet" type="text/css" />

Which will always resolve to the URL you mean to reference. When your site's domain changes, a central configuration will allow you to easily change it.

回答3:

I'm confused about your folder structure, but I understood correctly.

Try

href="../stylesheets/main.css"

回答4:

Sometimes the simple way ist the best way: use an absolute path!

来源：https://stackoverflow.com/questions/10420888/how-can-html-link-href-call-same-file-from-different-folders