Actually, it doesn't evaluate right-to-left for an arbitrary reason.
The complete expression is evaluated inside-to-outside. The innermost expression is [$i, $i++]. The comma operator, within a list context (which the [] provides), evaluates from right-to-left. (This is different from a scalar context where it evaluates the LHS, discards the value, then evaluates the RHS.)
It's not clearly spelled out, but you can look at p.108 (for the comma operator) and p.109 (for list contexts in general) of the 3rd ed. Camel.
Update: Roy Johnson's answer is much better than mine.
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Expressing a contrary opinion, whether to the individual or the group, is more often a sign of deeper thought than of cantankerous belligerence.
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