Setting custom environment variables using .htaccess

If you are familiar with Magento, esp with setting up multiple websites/stores using .htaccess then you may have encountered variables like: MAGE_RUN_CODE & MAGE_RUN_TYPE. Yes they are the custom environment variables.

In order to set up custom environment variables using .htaccess, try as follows:

RewriteRule ^ - [E=MAGE_RUN_CODE:default]
RewriteRule ^ - [E=MAGE_RUN_TYPE:store]

Where MAGE_RUN_CODE & MAGE_RUN_TYPE are custom environment variables.
and from php you can access this variable as:

echo $_SERVER['MAGE_RUN_CODE']; //prints default
echo $_SERVER['MAGE_RUN_TYPE']; //store

Hope this gave some info about custom environment variables.