PHP购物车显示问题

为我的网站创建购物车时，我为每个产品添加和删除功能。当我添加产品时，它会将其添加到表中的新行中，而不是当前行。PHP购物车显示问题

下面是用于添加和删除产品代码：

function addproduct($product_id, $product_qty){ 

$q = "SELECT p_name FROM Product WHERE product_id = $product_id LIMIT 1"; 
$result = mysqli_query($_SESSION['conn'],$q); 
$row = mysqli_fetch_array($result); 
$product_name = $row['p_name']; //get the product name from product id because it is better to display name than id in the cart 
if (isset($_SESSION['cart'])){ //if shopping cart is not empty 
    $cart = $_SESSION['cart']; 
    if (array_key_exists($product_name, $cart)){ //if the product exists, update      quantity 
     $cart[$product_name] += $product_qty; 
    } 
    else { //otherwise, add new product-quantity pair to the array 
     $cart[$product_name] = $product_qty; 
    } 
$_SESSION['cart'] = $cart; //write the updated array back to session variable 
} 
else { //if shopping cart is empty 
    $cart = array($product_name=>$product_qty); //add product and quantity to the       shopping cart 
    $_SESSION['cart'] = $cart; //write the updated array back 
} 
mysqli_free_result($result); 
} 
function deleteproduct($product_id, $product_qty){ 
$q = "SELECT p_name FROM Product WHERE product_id = $product_id LIMIT 1"; 
$result = mysqli_query($_SESSION['conn'],$q); 
$row = mysqli_fetch_array($result); 
$product_name = $row['p_name']; 
if (isset($_SESSION['cart'])){ //if shopping cart is not empty 
    $cart = $_SESSION['cart']; 
    if (array_key_exists($product_name, $cart)){ //if product exists, update quantity 
     $cart[$product_name] -= $product_qty; 
     if ($cart[$product_name] == 0){ //if the qty 0, delete key 
      unset($cart[$product_name]); 
     } 
    } 
    else { //exception 
     echo "<p>Error1</p>"; 
    } 
    $_SESSION['cart'] = $cart; //write array back to session variable 
} else { 
    echo "<p>Error2</p>"; 
} 
mysqli_free_result($result); 
}

来源

2013-03-12 Bradley Hodson

我们不需要在该代码中看到deleteproduct。你能举出$ product_name的例子吗？当你通过改变你的ifs你只能做一次时，你也会做两件事情。 – Popnoodles 2013-03-12 14:55:43

你的问题是什么？ – tlenss 2013-03-12 14:58:34

我的问题是我如何停止另一行被添加到表中时，我添加一个项目的额外数量？ – 2013-03-12 15:05:57

也许砍下这个

if (isset($_SESSION['cart'])){ //if shopping cart is not empty 
    $cart = $_SESSION['cart']; 
    if (array_key_exists($product_name, $cart)){ //if the product exists, update      quantity 
     $cart[$product_name] += $product_qty; 
    } 
    else { //otherwise, add new product-quantity pair to the array 
     $cart[$product_name] = $product_qty; 
    } 
$_SESSION['cart'] = $cart; //write the updated array back to session variable 
} 
else { //if shopping cart is empty 
    $cart = array($product_name=>$product_qty); //add product and quantity to the       shopping cart 
    $_SESSION['cart'] = $cart; //write the updated array back 
}

下降到三条线，让我知道，如果它仍然无法正常工作。

if (!isset($_SESSION['cart'])) $_SESSION['cart']=array(); 
if (!isset($_SESSION['cart'][$product_name])) $_SESSION['cart'][$product_name]=$product_qty; 
else $_SESSION['cart'][$product_name]+=$product_qty;

来源

2013-03-12 15:00:07 Popnoodles

我很感谢你的帮助，但我遇到的问题仍然存在 – 2013-03-12 15:10:21

PHP购物车显示问题

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