Question

This is an exension to this question where we learn that we can set a $_SERVER var using SetEnv.

The next question is: Is there a way to use SetEnv essentially like this:

/var/www/www.example.com/module/unique_section/.htaccess:

SetEnv RESOURCE_ROOT %{DIRECTORY}

/var/www/www.example.com/module/unique_section/some/path/file.php

<?php echo $_SERVER['RESOURCE_ROOT']; ?>

Output: /var/www/www.example.com/module/unique_section/

Answer 1

Depending on the information you require, you may be able to do this with a RewriteRule. For example:

RewriteEngine On
RewriteCond %{DOCUMENT_ROOT} (.*)
RewriteRule (.*) - [E=RESOURCE_ROOT:%1]

will set the PHP var $_SERVER['RESOURCE_ROOT'] or $_SERVER['REDIRECT_RESOURCE_ROOT'] to your Apache Document Root. See the mod_rewrite manual for full details, but some combination of %{DOCUMENT_ROOT}, %{PATH_INFO} and %{REQUEST_FILENAME} may work for you.

I don’t think it’s possible for the .htaccess file to know what directory it resides in. So I think you’ll need to use hardcoded paths inside your .htaccess file. As an example:

RewriteEngine On
RewriteCond %{DOCUMENT_ROOT} (.*)
RewriteRule (.*) - [E=RESOURCE_ROOT:%1/module/unique_section/]