I'm populating an array, which I then use in a foreach statement to print into an html table.
The issue I have is that I'm getting duplicates in the array ...

If the array doesn't change during the process of populating the HTML table, why not unique-ify the array with List::MoreUtils::uniq before processing it? (Update: I.e., don't worry about adding dups.) (Original ordering is preserved by uniq.)

>perl -wMstrict -le
"use List::MoreUtils qw(uniq);
 ;;
 my @ra = qw(one spam spam spam two spam three four spam spam five);
 ;;
 my @unique = uniq @ra;
 print qq{@unique};
"
one spam two three four five
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