程序运行截图如下：

源码如下：

<?php
    const discount = 0.8;
    $fruit1 = "橙子";
    $fruit2 = "柚子";
    $fruit3 = "橘子";
    $fruit1Num = 1;
    $fruit2Num = 2;
    $fruit3Num = 3;
    $fruit1Price = 6.88;
    $fruit2Price = 3.99;
    $fruit3Price = 3.28;

    $fruit1Total = $fruit1Num * $fruit1Price;
    $fruit2Total = $fruit2Num * $fruit2Price;
    $fruit3Total = $fruit3Num * $fruit3Price;

    $total = ($fruit1Total * $fruit2Total * $fruit3Total) * discount;
?>

<table border="1" cellpadding="1" cellspacing="1">
    <tr>
        <td>商品名称</td>
        <td>购买数量（斤）</td>
        <td>商品价格（元/斤）</td>
    </tr>
    <tr>
        <td><?php echo $fruit1; ?></td>
        <td><?php echo $fruit1Num; ?></td>
        <td><?php echo $fruit1Price; ?></td>
    </tr>
    <tr>
        <td><?php echo $fruit2; ?></td>
        <td><?php echo $fruit2Num; ?></td>
        <td><?php echo $fruit2Price; ?></td>
    </tr>
    <tr>
        <td><?php echo $fruit3; ?></td>
        <td><?php echo $fruit3Num; ?></td>
        <td><?php echo $fruit3Price; ?></td>
    </tr>
    <tr>
        <td colspan="3">
            商品折扣: <span><?php echo discount; ?></span>
        </td>
    </tr>
    <tr>
        <td colspan="3">
            打折后商品总价: <?php echo $total; ?>
        </td>
    </tr>
</table>

这里有几个要注意的地方：

①table中的border是那个表格的外边框，cellpadding指每个小格有多大，cellpadding指每个小格之间的距离；

②td中的colspan是指列的访问，上面的3就是，3个列合为1列。