一个文件包含另一个目录中有链接的文件，如何设置链接的相对路径？

my project directory as follows.

root 
  css
  img  
  src
    login 
       login.php
    dashboard
          basic
              header.php
              footer.php
              profile.php
              manage.php 
          department
              add_depart.php
    configuration
          config.php

Here the header.php included profile.php, manage.php , add_depart.php and config.php.

In the header.php have links point to the another files that are kept in basic folder. My problem is when i include the header.php in add_depart.php and config.php the links are not working. I know include only copy the file into add_depart.php. the links cant access within department folder.

How can i set relative path for the links inside the header.php can access the links provided by header from basic,department,and configuration folders.

I am also tried with getcwd() , dirname(__FILE__) .

Please Help.

Header.php

$path_r = $_SERVER['DOCUMENT_ROOT'];
$path_l = $path_r . '/root/src/dashboard/basic/';
 <li class="dropdown">
    <a href="#" data-target="#" class="dropdown-toggle" data-toggle="dropdown"> Settings <b class="caret"></b></a>
    <ul class="dropdown-menu">
        <li><a href="<?php echo $path_l ?>/profile.php">Profile</a></li>
        <li><a href="<?php echo $path_l ?>/config.php">Config</a></li>
        <li class="divider"></li>
        <li><a href="logout.php">Logout</a></li>
    </ul>
</li>

You're confusing the file system paths with the URL path.

$_SERVER['DOCUMENT_ROOT'] contains the absolute path to the document root on your server (the file system), not the URL. The same goes for getcwd() and dirname().

Just start the URLs with a slash: <a href="/path/to/profile.php" etc, and the URL's will be the same no matter where you include it.