我正在处理以下代码。我需要在表中添加每个类别的所有值。数据来自数据库。请先看图片：
这是我的HTML代码：
<table id="data" class="table table-bordered table-striped">
<thead>
<tr align="center">
<th width="5%">Item</th>
<th width="30%">Description</th>
<th width="5%">Unit</th>
<th width="5%">Qty</th>
<th width="10%">Unit Cost</th>
<th width="15%">Amount</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td colspan="5"><i>General Requirement</i></td>
</tr>
<?php
$id = $_GET['id'];
$select_bill = "SELECT *, quantity * unit_cost AS amount FROM bill_tbl WHERE project_name = $id";
$select_bill_result = mysqli_query($con,$select_bill);
if (mysqli_num_rows($select_bill_result)> 0) {
while ($row = mysqli_fetch_assoc($select_bill_result)) {
if ($row['category'] == 'General Requirement') {
?>
<tr>
<td></td>
<td><?php echo $row['description']; ?></td>
<td><?php echo $row['unit']; ?></td>
<td><?php echo $row['quantity']; ?></td>
<td><?php echo $row['unit_cost']; ?></td>
<td><?php echo $row['amount']; ?></td>
</tr>
<?php
}
}
}
?>
<tr>
<td></td>
<td colspan="4"><b>Subtotal</b></td>
<td></td>
</tr>
<tr>
<td>2</td>
<td colspan="5"><i>Concrete and Masonry Works</i></td>
</tr>
这是我学校的项目。