How to pass Apache environment variable to url in .htaccess

Question

I am setting a apache environment variable through php function, apache_setenv.

apache_setenv("EXAMPLE_VAR", "Example Value");

But I am having problem accessing this variable inside .htaccess I am not able to use this env variable inside .htaccess in anyway. but I can access it through php getenv().

And problem is not only by setting variable through php I am unable to access env variable set by .htaccess itself.

I've tried

Suppose env variable to be www.domain.com.

RewriteEngine On
RewriteCond ^(.*)$ test.php?id=%{ENV:VARIABLE} [L]

&

RewriteEngine On
RewriteCond %{ENV:VARIABLE} ^www.(.+)
RewriteRule ^ test.php?id=%1 [L]

And similar other test to just verify that env variable are set and functioning.

Mod_env and mod_rewrite is on.

A parent process (Apache) cannot access environment variables changed or set in a child process (PHP). — Olaf Dietsche, Apr 21 '17 at 15:02
PHP module is invoked after mod_rewrite module has completed it's run hence changed made via PHP are not seen in rewrite rules. — anubhava, Apr 21 '17 at 15:04
@anubhava @OlafDietsche But I am having issue even after setting them in `.htaccess`, I am unable to grasp the concept of env variable in `.htaccess`. and if I cannot access them in `.htaccess` what is the existence of apache_setenv serving here? — Abhishek Gurjar, Apr 21 '17 at 15:14
`apache_setenv ` is PHP function. How are you setting a variable in .htaccess? — anubhava, Apr 21 '17 at 15:16

score 2 · Accepted Answer · answered Apr 21 '17 at 15:30

2

Variable set using SetEnv directives are not seen by mod_rewrite due to sequence of module loading by Apache. Use SetEnvIf instead like that:

SetEnvIf Host ^ VAR=/foo/bin

Then use it in mod_rewrite rules:

RewriteEngine On

RewriteCond %{ENV:VAR} =/foo/bin
RewriteRule ^home/?$ /something [L,NC]

answered Apr 21 '17 at 15:30

anubhava

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Thanks sir, I got some other ideas from this as well. – Abhishek Gurjar Apr 22 '17 at 08:31

How to pass Apache environment variable to url in .htaccess

1 Answers1