public static function sort($data, $path, $dir = 'asc') {
		$flatten = function($flatten, $results, $key = null) {
			$stack = array();
			foreach ((array) $results as $k => $r) {
				$id = $k;
				if (!is_null($key)) {
					$id = $key;
				}
				if (is_array($r)) {
					$stack = array_merge($stack, $flatten($flatten, $r, $id));
				} else {
					$stack[] = array('id' => $id, 'value' => $r);
				}
			}
			return $stack;
		};
		$extract = static::extract($data, $path);
		$result = $flatten($flatten, $extract);

		$keys = static::extract($result, '/id');
		$values = static::extract($result, '/value');

		$dir = ($dir === 'desc') ? SORT_DESC : SORT_ASC;
		array_multisort($values, $dir, $keys, $dir);
		$sorted = array();
		$keys = array_unique($keys);

		foreach ($keys as $k) {
			$sorted[] = $data[$k];
		}
		return $sorted;
	}