Configure your application. You can load .ini, .json and .yaml files or MySQL DB.
Jasny Config is registred at packagist as jasny/config and can be easily installed using composer. Alternatively you can simply download the .zip and copy the file from the 'src' folder.
<?php
use Jasny\Config;
Config::i()->load('settings.yaml');
Config::i()->db = new Config('db.ini');
Config::i()->env = ($tmp = getenv('APPLICATION_ENV')) ? $tmp : 'prod';
Config::i()->load("$env.yaml", array('optional'=>true));