Array
(
    [idx] => 1
    [0] => Array
        (
            [quantity] => 1
            [product_id] => 2
            [parent_id] => 2
            [category_id] => 1
            [description] => Adult:0; Senior:1; Child:2
        )

)

how can display "description"

If you're talking about displaying only description, there really is only one way to do that:

echo $array_name[0]["description"];
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