Using a named variable on foreach loops is often a good idea from a readability standpoint, but the parent reply makes it sound like it will change the behavior. This is not true. foreach automatically localizes the index variable if it is a global. See perlsyn.

In reply to Re^2: while (my @row = $sth->fetchrow_array) by Errto
in thread while (my @row = $sth->fetchrow_array) by Win

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