所以我编辑了我自己的商店，但我遇到了一些问题，例如它添加2而不是1或者删除2而不是1，
你可以在www.neobotmx.org/test/tienda.php上看到它的外观＆lt;＆lt;＆lt;还没有为公众选择＆gt;＆gt;这就是为什么它在一个测试文件夹
商店代码：
<?php
$product_id = $_GET[id]; //the product id from the URL
$action = $_GET[action]; //the action from the URL
//if there is an product_id and that product_id doesn't exist display an error message
if($product_id && !productExists($product_id)) {
die("Error. Product Doesn't Exist");
}
switch($action) { //decide what to do
case "add":
$_SESSION['cart'][$product_id]++; //add one to the quantity of the product with id $product_id
break;
case "remove":
$_SESSION['cart'][$product_id]--; //remove one from the quantity of the product with id $product_id
if($_SESSION['cart'][$product_id] == 0) unset($_SESSION['cart'][$product_id]); //if the quantity is zero, remove it completely (using the 'unset' function) - otherwise is will show zero, then -1, -2 etc when the user keeps removing items.
break;
case "empty":
unset($_SESSION['cart']); //unset the whole cart, i.e. empty the cart.
break;
}
?>
<?php
if($_SESSION['cart']) { //if the cart isn't empty
//show the cart
echo "<table border=\"1\" align=\"center\" padding=\"3\" width=\"70%\">";
echo "<tr>";
//show this information in table cells
echo "<td align=\"center\"><strong>Producto</strong></td>";
//along with a 'remove' link next to the quantity - which links to this page, but with an action of remove, and the id of the current product
echo "<td align=\"center\"><strong>Cantidad</strong></td>";
echo "<td align=\"center\"><strong>Costo</strong></td>";
echo "</tr>";//format the cart using a HTML table
//iterate through the cart, the $product_id is the key and $quantity is the value
foreach($_SESSION['cart'] as $product_id => $quantity) {
//get the name, description and price from the database - this will depend on your database implementation.
//use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
$sql = sprintf("SELECT name, description, price FROM products WHERE id = %d;",
$product_id);
$result = mysql_query($sql);
//Only display the row if there is a product (though there should always be as we have already checked)
if(mysql_num_rows($result) > 0) {
list($name, $description, $price) = mysql_fetch_row($result);
$line_cost = $price * $quantity; //work out the line cost
$total = $total + $line_cost; //add to the total cost
echo "<tr>";
//show this information in table cells
echo "<td align=\"center\"><strong>$name</strong></td>";
//along with a 'remove' link next to the quantity - which links to this page, but with an action of remove, and the id of the current product
echo "<td align=\"center\"><strong>$quantity </strong><a href=\"$_SERVER[PHP_SELF]?action=remove&id=$product_id\">Borrar</a></td>";
echo "<td align=\"center\"><strong>$line_cost</strong></td>";
echo "</tr>";
}
}
//show the total
echo "<tr>";
echo "<td colspan=\"2\" align=\"right\"><strong>Total</strong></td>";
echo "<td align=\"right\"><strong>$total</strong></td>";
echo "</tr>";
echo "</table>";
}else{
//otherwise tell the user they have no items in their cart
echo "No tiene articulos en compra.";
}
//function to check if a product exists
function productExists($product_id) {
//use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
$sql = sprintf("SELECT * FROM products WHERE id = %d;",
$product_id);
return mysql_num_rows(mysql_query($sql)) > 0;
}
?>
</p>
<p><strong><a href="tienda.php">Seguir Comprando</a></strong></p>
<?php
现在显示书籍/物品/无论你想要什么。
<?php
define('MAX_REC_PER_PAGE', 1);
$sql = "SELECT id, name, description, price FROM products;";
$rs = mysql_query("SELECT COUNT(*) FROM products") or die("Imposible Realizar Operacion");
list($total) = mysql_fetch_row($rs);
$total_pages = ceil($total / MAX_REC_PER_PAGE);
$page = intval(@$_GET["page"]);
if (0 == $page){
$page = 1;
}
$start = MAX_REC_PER_PAGE * ($page - 1);
$max = MAX_REC_PER_PAGE;
$rs = mysql_query("SELECT id, name, description, price FROM products ORDER BY id
ASC LIMIT $start, $max") or die("Imposible Realizar Operacion");
?>
<table width="100%" height="404" border="0" cellpadding="12">
<?php
while (list($id, $name, $description, $price) = mysql_fetch_row($rs)) {
?>
<tr>
<td height="46" align="left" valign="middle"><p><strong> Producto :
<?= htmlspecialchars($name) ?>
</strong>
</p></td>
</tr>
<tr>
<td height="172" align="left" valign="middle"><p><strong>Descripcion :</strong></p>
<p>
<strong>
<?= htmlspecialchars($description) ?>
</strong></p></td>
</tr>
<tr>
<td height="67" align="left" valign="middle"><p><strong>Precio :
<?= htmlspecialchars($price) ?> </strong>
</p></td>
</tr>
<tr>
<td height="109" align="center" valign="middle"><strong><? echo "<a href=\"pedido.php?action=add&id=$id\">Comprar</a>" ?> </strong></td>
</tr>
<?php
}
?>
</table>
<table border="0" cellpadding="5" align="center">
<tr>
<td><strong>Pagina : </strong></td>
<?php
for ($i = 1; $i <= $total_pages; $i++) {
$txt = $i;
if ($page != $i)
$txt = "<a href=\"" . $_SERVER["PHP_SELF"] . "?page=$i\">$txt</a>";
?>
<td align="center"><?= $txt ?></td>
<?php
}
?>
</table>
我不知道它的错误在哪里......
Ty的帮助：）
Obiusly你必须：
<?php session_start();?>
include your database
etc
答案 0 :(得分：2)
你有这种风格：
body {
background-image: url();
}
导致浏览器再次请求该页面，再次将其添加到购物车。
代替呈现购物车页面，代码修改购物车后，应该将重定向发送到购物车页面。