7. Add custom environment variables

If your application requires a variable to determine if it is run under development or production, you can easily add it and make PHP aware of it.

Table of Contents

7.1. Add custom environment variables

This is fairly simple. Any variable inside the .env file is considered an environment variable and automatically known to PHP.

If you for example require a variable APPLICATION_ENV, with a value of production, you would add the following to the .env file:


You need to restart the Devilbox for the changes to take effect.


There is already a proposed section inside the .env file at the very bottom to add you custom variables to differentiate them from the Devilbox required variables.

7.2. Use custom environment variables

Accessing the above defined environment variable on the PHP side is also fairly simple. You can use the PHP’s built-in function getenv to obtain the value:

// Example use of getenv()
echo getenv('APPLICATION_ENV');