[英]Substract Session[cart] QUANTITY to STOCK QUANTITY in db
我有一张桌子,上面显示着($ _SESSION ['cart']产品,里面有一个表格,可以在其中手动输入想要的数量到($ _SESSION ['cart']产品中。
<form name="formulario2" method="POST" target="oculto"><input type="hidden" name="action" value="update">
foreach($_SESSION['cart'] as $product_id => $quantity) {
echo "<td align=\"center\"><input type = \"text\" size=\"1\" name=\"qty[$product_id]\" value =\"{$_SESSION['cart'][$product_id]}\"></td>";
}
</form>
然后,我使用以下代码来更新($ _SESSION ['cart'])数量
<?php
if(isset($_POST['action']) && ($_POST['action'] =='update')){
//
foreach ($_POST['qty'] as $product_id=> $quantity){
$qty = (int)$quantity;
if ($qty > 0){
$_SESSION['cart'][$product_id] = $qty;
}
}
}
?>
现在,我要将已更新为($ _SESSION ['cart'])的那些数量替换为数据库中STOCK中的数量。
我认为在最后的“ foreach($ _POST ['qty']”中,我也应该说将UPDATE QUANTITY减去数据库QUANTITY,但是我不知道该怎么做。有什么帮助吗?
1)将value =\\"{$_SESSION['cart'][$product_id]}\\"
替换为value =\\"{$quantity}\\"
。 您已经在foreach
语句中对其进行了检索。 2)对于数据库,如果您使用的是mysql,我建议您使用PDO访问数据库(由于缺少缩进和不匹配的括号,我重写了第二段代码):
<?php
if ((isset($_POST['action']) && ($_POST['action'] == 'update'))
{
foreach ($_POST['qty'] as $product_id => $quantity)
{
$qty = intval($quantity);
$pid = intval($product_id); // ALSO use the intval of the $product_id,
// since it was in a form and it can be hacked
$_SESSION['cart'][$pid] = $qty; // NOTE: you need to also update the
// session`s cart with 0 values, or
// at least to unset the respective
// product:
// unset($_SESSION['cart'][$pid])
if ($qty > 0)
{
// now update the DB:
$mysql_host = "127.0.0.1";
$mysql_user = "root";
$mysql_password = "";
$mysql_database = "myShop";
$dbLink = new PDO("mysql:host=$mysql_host;dbname=$mysql_database;charset=utf8", $mysql_user, $mysql_password, array(PDO::ATTR_PERSISTENT => true));
$dbLink->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
$query = $dbLink->prepare("update `products` set `stock` = `stock` - ? WHERE `productId` = ? limit 1");
$query->execute(array($qty, $pid));
}
}
}
?>
希望这对你有用!
问候!
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