public function flush()
	{
		$index	= new DirectoryIterator( $this->path );
		$number	= 0;
		foreach( $index as $entry )
		{
			if( $entry->isDot() || $entry->isDir() )
				continue;
			if( substr( $entry->getFilename(), -7 ) == ".serial" )
				$number	+= (int) @unlink( $entry->getPathname() );
		}
		$this->data	= array();
		return $number;
	}