Allow Multiple Products in Array

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Newbie question. I have an array that currently outputs a single product:

"Product" => $product_code

If I want to allow for multiple product_codes (in an instance where user chooses more than one product), how would I change the array to allow for multiple products?

[Dan Grossman]

Arrays can contain arrays

$array['product'] => array('product1', 'product2', 'product3');