Or slightly more compactly (using trinary math instead of the trinary operator): 
(abs($a - $b) <=> $max_spread) * ($b <=> $a)

[download]
where $max_spread is the maximum range you expect your numbers to cover before wrapping. 50_000 might be a better choice than 200.
Caution: Contents may have been coded under pressure.

In reply to Re^3: Sorting through a rollover by Roy Johnson
in thread Sorting through a rollover by onegative

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