PhpBench\Storage\Archiver\XmlArchiver::filterExisting PHP Method

    private function filterExisting($driver, array $files)
    {
        $newFiles = [];
        foreach ($files as $file) {
            // by this point the last 4 chatacters of the filename
            // will be ".xml", so we strip them off and rest MUST
            // be the identifier.
            $identifier = substr($file->getFilename(), 0, -4);
            // if the driver already has the given identifier, then
            // skip it.
            if ($driver->has($identifier)) {
                continue;
            }
            $newFiles[] = $file;
        }
        return $newFiles;
    }