Added comments

Config.php

<?php
class Config {
	//$path is the value that going to be pass thought for exmaple Config::get('mysql/host') the part 'mysql/host' will be the path.
	public static function get($path = null){
		if($path) {
			//$config make it easier to write $GLOBALS['config'];
			$config = $GLOBALS['config'];
			// Explode will read value my parts and the / for example mysql/host mysql is first part and mysql is the seconned part.
			$path = explode('/', $path);
		}
	}
}
?>