hi, I am reading the perl code of Blosxom, I can not quite catch the meaning of this expressiong: %month2num = (nil=>'00', Jan=>'01', Feb=>'02', Mar=>'03', Apr=>'04', May=>'05', Jun=>'06', Jul=>'07', Aug=>'08', Sep=>'09', Oct=>'10', Nov=>'11', Dec=>'12'); @num2month = sort { $month2num{$a} <=> $month2num{$b} } keys %month2num;
