Config.php

<?php

class Config {

    private static $store = array();

    public static function get($index, $default = null) {
        $index = explode('.', $index);

        if($index[0] == 'app'){
            if(!isset(self::$store['app'][$index[1]])){
                if(file_exists(DIR_APP_CONFIG . $index[1] . EXT)){
                    self::$store['app'][$index[1]] = include_once DIR_APP_CONFIG . $index[1] . EXT;
                } else {
                    throw new Edge_Exception('No such config file :file in :in', array(":file" => $index[1] . EXT, ":in" => DIR_APP_CONFIG));
                }
            }
            $cfg = self::$store['app'][$index[1]];
        }

        try {
            $return = self::getValue($index, self::$store);
        } catch (Edge_Exception $e) {
            if (!is_null($default)) {
                $return = $default;
            } else {
                throw $e;
            }
        }
        return $return;
    }

    protected static function getValue($index, $value) {
        if (is_array($index) and count($index)) {
            $current_index = array_shift($index);
        }
        if (is_array($index) and count($index) and isset($value[$current_index]) and is_array($value[$current_index]) and count($value[$current_index])) {
            return self::getValue($index, $value[$current_index]);
        } elseif (isset($value[$current_index])) {
            return $value[$current_index];
        } else {
            throw new Edge_Exception("Attempt to access missing configuration variable: :current_index",
                array(":current_index" => $current_index)
            );
        }
    }

}

//End Config