get values of all checkboxes (checked or unchecked)with same name

I am trying to build a form that lists all available items and users can select some items and enter a value to input element aside the checkbox.

Each checkbox has a input text box aside it.

<?php
    foreach ($items as $item):
        $itemID = $item['item_id'];
        $itemTitle = $item['item'];
?>
    <tr>
        <td>
            <li> 
                <div class="checkbox">
                    <input type="hidden" name="selected_items[]" value="0">
                    <input type='checkbox' name='selected_items[]' value='<?php echo $itemID; ?>'/> 
                <?php echo ucfirst($itemTitle); ?>

                </div>
            </li>
        </td>
        <td><input type='number' name='quantities[]' value="0.00" step="0.01" /> </td>
    </tr>
<?php endforeach; ?>

Here's how the form looks:

Available Items    |  Qty
--------------------------
[] Bread           |  [input]
[] Coffee          |  [input]
[] Egg             |  [input]
[] Cake            |  [input]

I want the two arrays : selected_items[] and quantities to be of the same length as they are so I can combine them.

If unchecked, value should be left to 0.

So, combined_array should look like:

0=>0
Coffee=>44
Egg=>56
0=>0

Can anyone help me with this?