Deployment\SshServer::purge PHP Method

    public function purge($dir, callable $progress = NULL)
    {
        $dirs = $entries = [];
        $iterator = dir($path = "ssh2.sftp://{$this->sftp}{$dir}");
        while (FALSE !== ($entry = $iterator->read())) {
            if ($entry !== '.' && $entry !== '..') {
                $entries[] = $entry;
            }
        }
        foreach ($entries as $entry) {
            if (is_dir("{$path}/{$entry}")) {
                $dirs[] = $tmp = '.delete' . uniqid() . count($dirs);
                $this->protect('rename', ["{$path}/{$entry}", "{$path}/{$tmp}"]);
            } else {
                $this->protect('unlink', ["{$path}/{$entry}"]);
            }
            if ($progress) {
                $progress($entry);
            }
        }
        foreach ($dirs as $subdir) {
            $this->purge("{$dir}/{$subdir}", $progress);
            $this->protect('rmdir', ["{$path}/{$subdir}"]);
        }
    }