HTML form in while loop, how to transfer data from each item?

I have tried to solve it and look around but not even sure what I should be searching for.

I have made a product grid through a while loop, in the loop with each product and input-tag has been used for users to mark how many items of each product is wanted.

The product grid

However I have trouble distinguishing the value of each input field and what "name" it should be stored under to be able to retrieve it when running the second script of processing the order? I also need to be able to connect an id with each value.

The code for the grid: I know I need to make a unique name in the input name, however how and which makes sense?

<div id="content">
    <h1>Products</h1>

    <form action="processorder.php" method="post">
    <table align="center">
        <?php

        $db = include "connect2db.php"; 

        mysqli_set_charset($db,"utf8");

        $query = 'SELECT * FROM products_josie';

        $result = $db->query($query);


        $count = 0;
        while($res=$result->fetch_assoc())
        {
            if($count==3)
            {
               echo '</tr>';
               $count = 0;
            }
            if($count==0)
               echo '<tr>';
               echo '<td>';
               ?>

               <a href="productsdetails.php?clickedid=<?php echo $res['product_id']?>">
               <img src="products/<?php echo $res['photo']; ?>" width="200" height="150"/>
               </a>
               <br/>
            <?php
            echo '<p>';
            echo $res['product_name'];
            echo '</br>';
            echo 'DKK ';
            echo $res['price'];
            echo '</p>';
            echo '<p>';
            echo '<input type="number" name="amount" min="0"';
            echo '</p>';
            $count++;
            print '</td>';
        }
        if($count>0)
            print '</tr>';
        ?>
    </table>

    <input type="submit" value="Submit Order">
    </form>
</div>