Kraken\Filesystem\FilesystemManager::append PHP Method

    public function append($path, $contents)
    {
        list($prefix, $path) = $this->filterPrefix($path);
        if (($fs = $this->getFilesystem($prefix)) === null) {
            throw new WriteException("No filesystem saved under prefix [{$prefix}].");
        }
        $fs->append($path, $contents);
    }