Set an Environment Variable in .Htaccess and Retrieve It in PHP

Set an environment variable in .htaccess and retrieve it in PHP

Assuming your configuration has AllowOverrides with .htaccess, you must enable mod_env in Apache for this to work.

Apache - mod_env

Setting environment variable using .htaccess

1. Check that the htaccess is being read at all, make sure you've configured your host so that it allows (at the very least) "FILEINFO", or better yet, set it to "ALL"

   AllowOverride ALL
   

2. If not, make sure your mod_env module is being loaded in your server config.

3. Make sure you're looking in the right place. Apache internal environment variables are passed along to php via the $_SERVER[] array (on the phpinfo() page, under Apache Environment) and they are different from php runtime environment variables.(which are under Environment),

how can I define variable in .htaccess file and use it?

You can't use SetEnv that way because it's not processed yet.

The internal environment variables set by this directive are set after
most early request processing directives are run, such as access
control and URI-to-filename mapping. If the environment variable
you're setting is meant as input into this early phase of processing
such as the RewriteRule directive, you should instead set the
environment variable with SetEnvIf.

What you are looking for is setenvif instead of SetEnv

So you should be able do something like

SetEnvIf Request_URI "^.*" base_path=/cig/base3

http://httpd.apache.org/docs/2.2/mod/mod_setenvif.html#setenvif

Can htaccess read a server environment variable set in Apache?

Yes it is.

You will probably want to use mod_setenvif functionality, so that module will need to be turned on.

Then you simply do something like:

SetEnvIf Request_URI "\.gif$" image_type=gif

Which would set the environmental variable image_type with a value of gif if the requested file name ends with .gif.

You could then access this (like in RewriteCond) like this:

RewriteCond %{ENV:image_type} gif
RewriteRule ^(.*) $.gif

You can read the full documentation here: http://httpd.apache.org/docs/2.2/env.html

Reading environnement variables set from htacess inside php code

the local server I'm using is the built in local symfony server.

.htaccess is an Apache config file. If you are using the built-in symfony web server (or the PHP built-in web server) then this is not Apache and the .htaccess file is not going to be processed (and the env vars are not going to be set).

If you need the .htaccess file to be processed for your application logic then you'll need to run Apache, or move this logic to your application/PHP.

Apache htaccess SetEnv: how concatenate environment variable in htaccess?

%{DOCUMENT_ROOT} variable is part of mod-rewrite so
You can set env for a document root using SETenv directive, try this mod-rewrite based example :

RewriteEngine on

RewriteRule ^ - [E=SpecialPath:%{DOCUMENT_ROOT}/dir/,L]

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