php - I want to overwrite cookie value according to the id


In this code i want to overwrite the cookie values according to the id. Once you add one value into cookie of id=55 and again if i am add new value from same id the cookie value updated with new value of same id not add.
Here is my code

<form method='post'>
<input type="text" hidden="hidden" value="<?php echo $prdctid;?>" name="id">
<input type="number" name="name" value="1" min="1" max="10" />
<input type="submit" id="submit" name="submit" value="Add" />


    $qtyprid = $_POST['id'];

    $qtyval = $_POST['name'];



    $cookie = $_COOKIE['qty_items_cookie'];

    $cookie = stripslashes($cookie);

    $saved_cart_qty = json_decode($cookie, true);





        foreach($saved_cart_qty as $key=>$value){




    $json = json_encode($cart_qty, true);

    setcookie('qty_items_cookie', $json);

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