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popup_menu(-name=>"array",
    -values=>[sort {$array{$a} <=> $array{$b}} keys %array],
    -labels=>\%array,
    -default=>$array1,
    -class=>"formfield")

use CGI qw/:standard/;

my %array = (a => 2, b=>1, c=>3);
...
<option  value="a">2</option>
<option  value="c">3</option>
</select>