5.2 output_fns.php文件中的函数display_cart()
function display_cart($cart,$change = true,$images = 1) //显示购物车
{
echo "<table border="0" width="100%" cellspacing="0">
<form action="show_cart.php" method="post">
<tr>
<th colspan="". (1 + $images) ."" bgcolor=" #cccccc">Item</th>
<th bgcolor="#cccccc">Price</th>
<th bgcolor="#cccccc">Quantity</th>
<th bgcolor="#cccccc">Total</th>
</tr>";
//输出购物车中每一项
foreach($cart as $isbn => $qty)
{
$book = get_book_details($isbn);
echo "<tr>";
if($images == true)
{
echo "<td align="left">";
if(file_exists("images/". $isbn .".jpg"))
{
$size = getimagesize("images/". $isbn .".jpg");
if(($size[0] > 0) && ($size[1] > 1)) //图片长宽
{
echo "<img src="images/". $isbn .".jpg"
style="border: 1px solid black"
width="". ($size[0] / 3) .""
height="". ($size[1] / 3) .""/>";
}
}
else
echo " ";
echo "</td>";
}
echo "<td align="left">
<a href="show_book.php?isbn=". $isbn ."">". $book['title'] ."</a> by". $book['author'] ."</td>
<td align="center">$". number_format($book['price'],2) ."</td><td align="center">";
//如果允许更改数量
if ($change == true)
{
echo "<input type="text" name="".$isbn."" value="".$qty."" size="3">";
}
else
{
echo $qty;
}
echo "</td><td align="center">$".number_format($book['price']*$qty,2)."</td></tr>
";
}
//总数
echo "<tr>
<th colspan="". (2 + $images) ."" bgcolor = "#cccccc"> </th>
<th align = "center" bgcolor="#cccccc">". $_SESSION['items'] ."</th>
<th align = "center" bgcolor="#cccccc">$". number_format($_SESSION['total_price'],2) ."</th></tr>";
//保存按钮
if($change == true)
{
echo "<tr>
<td colspan = "". (2 + $images) .""> </td>
<td align = "center ">
<input type="hidden" name="save"value="true" />
<input type = "image" src = "images/save-changes.gif" border = " 0 " alt = " Save Changes " />
</td>
<td> </td>
</tr>";
}
echo "</form></table>";
}
5.3 book_fns.php文件中的函数calculate_price()
function calculate_price($cart) //计算购物车中物品总价
{
$price = 0.0;
if(is_array($cart))
{
$conn = db_connect();
foreach($cart as $isbn => $qty)
{
$query = "select price from books where isbn ='". $isbn ."'";
$result = $conn ->query($query);
if($result)
{
$item = $result ->fetch_object();
$item_price = $item ->price;
$price += $item_price * $qty;
}
}
}
return $price;
}
