https://github.com/vlucas/phpdotenv
For a while now, i've been using Symfony's YAML to add a configuration file on my PHP projects.
Today, i stumbled upon Vance Lucas's PHPDotEnv which is a great PHP package that will transfer the contents of a .env file right inside your PHP's $_ENV variable. Available through Composer too.
Easiest method to add configuration files to your PHP projects ever!