อยากทราบวิธี ส่ง id เข้า modal bootstrap 4 จนปัญญาแล้วจริงๆ

<?php session_start();
  if (!isset($_SESSION['UserID'])) {
      $_SESSION['UserID'] = '';
      $_SESSION['Username'] = '';
  }

    include 'admin/Function/comfig.php';
    $sql = 'SELECT * FROM product';
    $query = mysqli_query($objCon, $sql);
  ?>
<div class="container">
  <div class="card-body">
    <div class="table-responsive">
      <table class="table table-bordered" id="dataTable" width="100%" cellspacing="0">
        <thead class="thead-dark text-center">
            <th scope="2">ยี่ห้อ</th>
            <th scope="col">รุ่น</th>
            <th scope="col">ชื่ออุปกรณ์</th>
            <th scope="col">จำนวน</th>
            <th scope="col">วันที่นำเข้า</th> 
            <th>รูปสินค้า</th>
            <th></th>
<tbody class="text-center">
<?php while ($result = mysqli_fetch_array($query, MYSQLI_ASSOC)) {
      ?>
<tr>
<th><?php echo $result['Brand']; ?></th>
<th><?php echo $result['Generation']; ?></th>
<th><?php echo $result['Device_name']; ?></th>
<th><?php echo $result['value']; ?></th>
<th><?php echo $result['Amount']; ?></th> 
<th><img src="admin/img/<?= $result['Brand_img']; ?>" style="width:100px"></th>
<th><button class="btn btn-dark" data-toggle="modal" data-target="#product" data-id="<?php echo $result['id']; ?>"  >ยืม<?php echo $result['id']; ?></button></th>
<?php
  } mysqli_close($objCon); ?>
    </tr>
        </tbody>
            </table>
                </div>
                    </div>
                        </div>

<div class="modal fade" id="product" tabindex="-1" role="dialog" aria-labelledby="Productid" aria-hidden="true">

  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="Productid">ยืม อุปกรณ์ไอที <?php  echo $result['id']; ?></h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
        
      </div>
      <form action="laypang/add.php" method="post" name="form" id="demo-form2" data-parsley-validate class="form-horizontal form-label-left">
     <?php $return_date = date(('Y-m-d'), strtotime('+15 days', strtotime(date('Y-m-d')))); ?>
      <div class="modal-body">
      <div class="form-group">
      <input type="date" id="borrow_date" required="required" class="form-control" name="borrow_date" value="<?php echo date('Y-m-d'); ?>">
        </div>
        <div class="form-group">
      <select class="form-control" id="borrow_num"  name="borrow_num">>
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
      <option value="4">4</option>
      <option value="5">5</option>
      <option value="6">6</option>
      <option value="7">7</option>
      <option value="8">8</option>
      <option value="9">9</option>
      <option value="10">10</option>
    </select>
</div>
    <div class="form-group">
      <input type="date" id="return_date" required="required" class="form-control" name="return_date" value="<?php echo $return_date; ?>">
        </div>

    </div>
      <div class="modal-footer">
        <button type="reset" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="submit"  class="btn btn-primary">Save changes</button>
        <input TYPE="hidden" NAME="UserID" value="<?php echo $_SESSION['UserID']; ?>">
        <input TYPE="hidden" NAME="product_id" value="<?php echo $result['id']; ?>">

        </form>
      </div>
    </div>
  </div>
</div>