VersionPress\Utils\PathUtils::realpath PHP Method

    private static function realpath(array $pathFragments)
    {
        $realpath = [];
        foreach ($pathFragments as $fragment) {
            if ($fragment === '.') {
                continue;
            }
            if ($fragment === '..') {
                array_pop($realpath);
                continue;
            }
            $realpath[] = $fragment;
        }
        return $realpath;
    }