[英]Substract Session[cart] QUANTITY to STOCK QUANTITY in db
我有一張桌子,上面顯示着($ _SESSION ['cart']產品,里面有一個表格,可以在其中手動輸入想要的數量到($ _SESSION ['cart']產品中。
<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,我使用以下代碼來更新($ _SESSION ['cart'])數量
<?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] = $qty;
}
}
}
?>
現在,我要將已更新為($ _SESSION ['cart'])的那些數量替換為數據庫中STOCK中的數量。
我認為在最后的“ foreach($ _POST ['qty']”中,我也應該說將UPDATE QUANTITY減去數據庫QUANTITY,但是我不知道該怎么做。有什么幫助嗎?
1)將value =\\"{$_SESSION['cart'][$product_id]}\\"
替換為value =\\"{$quantity}\\"
。 您已經在foreach
語句中對其進行了檢索。 2)對於數據庫,如果您使用的是mysql,我建議您使用PDO訪問數據庫(由於缺少縮進和不匹配的括號,我重寫了第二段代碼):
<?php
if ((isset($_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));
}
}
}
?>
希望這對你有用!
問候!
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.