PHP's documentation for foreach states that if you iterate by reference
[foreach ($ii as &$i) ...], you should unset $i after the loop. $i
still points to the last element of the array - updating $i or reusing
it will update the last element of the array.
In short, why doesn't PHP automatically unset $i after the loop? I
can't think of too many cases where you would want to hold on to that
reference after you exit the loop, but I can think of a lot of scenarios
where a user could accidentally tamper the array by using $i in a
different context later on (especially since loop variable names often
are reused).
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