"c-style" is just the name of the loop, it depends what you need...TIMTOWTDI! (*)

Anyway, with foreach-loop you shouldn't need a new array, since the iterating variable is an alias.

        for $value ( @values) {
            $value=_clean_cgi_param($value);
        }
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(*)UPDATE: in many cases foreach-loops are easier to maintain and less redundant than c-style. If you explicitly need to generate a *new* array, prefere map or grep.