public static function get(array $arr, $k, $default=null)
	{
		if ( isset($arr[$k]) ) return $arr[$k];

		$nested = explode('.',$k);
		foreach ( $nested as $part ) {
		    if (isset($arr[$part])) {
				$arr = $arr[$part];
				continue;
		    } else {
				$arr = $default;
				break;
		    }
		}
		return $arr;
	}