Sure, it looks cool. It's just wrong :)

The problem with xor on strings is it will extend short ones. There are now 0 bytes there that weren't there before, and length changes.

$ perl -e'$a="a"; $b="bbb"; $a^=$b; $b^=$a; $a^=$b; print "/$a/,/$b/\n
+"; print length($a),"\n"; print length($b),"\n"'
/bbb/,/a/
3
3
[download]

--
Mike