BASIC INFORMATION:
Applications require a centralized place where settings are stored. All the values stored here are required to configure the behavior of the application and to define the resources for other entities of the application. [1]
Application configuration contains tools for storing configuration variables and PHP runtime environment manipulation
A Config object can be used to store any type of PHP variables. An application can have multiple named singleton configuration objects. These objects are accessible via a static Config::instance() method.
PHP utility class handles common PHP configuration related tasks via build-in singleton PHPConfig and named PHPIni instances.