PHP config class supporting dot notation

PHP config class

class Config
{
    /**
     *@var array
     */
    private static $config = null;

    /**
     * Returns a config setting.
     * @param string $name
     * @return mixed
     */
    public static function get($name)
	{
		if (is_null(self::$config)) {
			$base_config = require_once('config_base.php');
			$site_config = include_once('config.php');
			$config = array_merge($base_config, $site_config);
			self::$config = $config;
		}

		if (strpos($name, ".")) {
			$parts = explode(".", $name);
			$val = self::$config;
			foreach ($parts as $part){
				if (isset($val[$part])) {
					$val = $val[$part];
				} else {
					throw new \Exception("Unknown setting '" . $name . "' requested.");		
				}
			}

			return $val;
		} else {

			if (isset(self::$config[$name])) {
				return self::$config[$name];
			} else {
				throw new \Exception("Unknown setting '" . $name . "' requested.");
			}
		}
	}
	
}