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As in other interpreters (JavaScript, e.g.), PERL allows you to execute a string using the eval function
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Suppose you had two arrays $fred[$index] and $jim[$index] and you wanted to give them a value of $index and an ascii string $name (which could be input) taking value 'fred' or 'jim'. This can be achieved by:
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eval('$' . $name . '[' . $index . ']') = $value;
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eval returns result of evaluating its argument
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In this case, you can achieve the same results with indexed hashes:
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$options[$index]{$name} = $value;
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using multidimensional array notation
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