@'={$}=>,{}=>0x70,*,,0x6A,$={$$}=>0x68,*,,0x61,};
$..=chr$_ foreach sort keys%{@'};
$_=$.,s<^.*(.)(.)(.)(.)>@$2$4$3$1@.print;

[download]
Apparently perl 5.6 (or at least, ActiveState's perl 5.6.1) does strange, bizarre things when you try to set $, to some value that begins with \x00: 
C:\>perl -e "$, .= qq[\x00hjap]; print $,;"
 mult
C:\>perl -e "$. .= qq[\x00hjap]; print $. ;"
 hjap
C:\>perl -e "$; .= qq[\x00hjap]; print $; ;"
  hjap

[download]
That first blank character there in the first two output lines is character 0, not a space; with $; you first see character 28, then character 0, then hjap. (my browser won't let me enter character number 28 - even if it could, that's not nice content on an html page) Note that perl 5.8 (though I've only tried cygwin's) does what you'd expect.

I have my suspicions that what's happening in per 5.6 is that it's looking at some spot inside memory that's based on the string's length - for any string that's less than 8 characters, what happens is that I get that many characters returned of \x00multi-; for larger strings I get something like this: (not a real code block, so that I could paste in all those whacky special characters in the 1-31 range)

C:\>perl -e "$, .= qq{\x00abcdefghijklmnopqrstuvwxyzaabbccddeeffgghhiijjkkllmmnn
ooppqqrrssttuuvvwwxxyyzzaaabbbcccdddeeefffggghhhiiijjjkkklllmmmnnnooopppqqqrrrss
stttuuuvvvwwwxxxyyyzzzaaaabbbbccccddddeeeeffffgggghhhhiiiijjjjkkkkllllmmmmnnnnoo
ooppppqqqqrrrrssssttttuuuuvvvvwwwwxxxxyyyyzzzz}; print $,;"
 ad     ◄   ┴   ðBâ☺ Bâ☺¶?â☺Þ>â☺d>â☺D=â☺┤<â☺ý;â☺Ó:â☺$;â☺└9â☺,9â☺ÿ8â☺♀8â☺É:â☺¶6â☺
x6â☺╠5â☺(5â☺ÿ3â☺©2â☺d2â☺l%â☺©)â☺t4â☺8)â☺(!â☺l∟â☺©←â☺­→â☺@→â☺ÿ↨â☺8↨â☺ÿ▬▬â☺t§â☺ȶâ
☺►¶â☺`‼â☺¼↕â☺Ó◄â☺T◄â☺░►â☺ð☼â☺h☼â☺▄♫â☺┴    ·  Èîâ☺ê┤â☺efghijklmnopqrstuvwxyzaabbc
cddeeffgghhiijjkkl
--
@/=map{[/./g]}qw/.h_nJ Xapou cets krht ele_ r_ra/;
map{y/X_/\n /;print}map{pop@$_}@/for@/

[download]

In reply to Cross-perl-version compatible version by fizbin
in thread Rising Force by cristian

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