After some thought, I'd like to modify the if to this:
if (($array[$x] + 1 == $array[$x+1]) &&
($array[$x] + 2 == $array[$x+2])) {
That way you don't end up with display-length sub-lists like "1-2, 4-5" in lists. Again, I'm sure there's a better way, but...
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