PHP購物車沒有顯示大量產品

Question

我製作了一個php購物車，它顯示主屏幕上的所有產品，您可以點擊它們並將它們添加到您的購物籃中，然後將您帶到購物中心購物車屏幕。這隻會顯示一種產品，但會顯示您添加了多少種不同產品的數量，即使它們都具有不同的標題。總的價格和數量的工作，其唯一的產品名稱沒有。這是我的代碼..

<?php 
session_start(); 
include "connect.php"; 
include "header.php"; 

function viewcart(){ 
if (isset($_SESSION['cart'])){ //if shopping cart is not empty 
    $cart = $_SESSION['cart']; //store the cart array into a variable then display the content 
    echo "<table border=\"1\"><tr><th>Product Name</th><th>Quantity</th><th>Delete</th></tr>"; 
    foreach ($cart as $product=>$quantity){ 
     $q = "SELECT ID, Name FROM Products"; 
     $result = mysqli_query($_SESSION['conn'],$q); 
     $row = mysqli_fetch_array($result); 
     $product_id = $row[0]; 
     echo "<tr><td>$product</td><td>$quantity</td><td><a href=\"?action=delete&product=$product_id\">-</a></td></tr>"; 
     mysqli_free_result($result); 
    } 
    echo "</table>"; 
    subtotal($cart); //display the subtotal 
} else { //if shopping cart is empty 
    echo "<p>There is no product in your shopping cart.</p>"; 
} 


} 

function addproduct($product_id, $product_qty){ 

$q = "SELECT ID, Name FROM Products"; 
$result = mysqli_query($_SESSION['conn'],$q) 
or die("Error: ".mysqli_error($_SESSION['conn'])); 
$row = mysqli_fetch_array($result); 
$product_name = $row[1]; //get the product name from product id because it is better to display name than id in the cart 
if (isset($_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 Name FROM Products"; 
$result = mysqli_query($_SESSION['conn'],$q); 
$row = mysqli_fetch_array($result); 
$product_name = $row['Name']; 
if (isset($_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] -= $product_qty; 
     if ($cart[$product_name] == 0){ //if the quantity is 0, delete the key 
      unset($cart[$product_name]); 
     } 
    } 
    else { //exception 
     echo "<p>Error!</p>"; 
    } 
    $_SESSION['cart'] = $cart; //write the updated array back to session variable 
} else { 
    echo "<p>Error!</p>"; 
} 
mysqli_free_result($result); 
} 

function emptycart(){ 

if (isset($_SESSION['cart'])){ //if shopping cart is not empty 
    unset($_SESSION['cart']); 
} 
else { 
    echo "<p>Error!</p>"; 
} 
} 


function subtotal($cart){ //calculate the total value of products in the shopping cart 
$total = 0; //initialise total 
if (!empty($cart)){ 
    foreach ($cart as $product => $quantity){ 
     $q = "SELECT ID, Price FROM Products"; 
     $result = mysqli_query($_SESSION['conn'],$q); 
     $row = mysqli_fetch_array($result); 
     $price = $row['Price']; 
     $total += $price * $quantity; 
    } 
    echo "<p>Total: $total | <a href=\"?action=empty\">Empty cart</a></p>"; 
} else { 
    unset($_SESSION['cart']); //do not need to keep an empty cart, so delete it 
    echo "<p>There is no product in your shopping cart.</p>"; 
} 
} 


if (isset($_GET['action'])){ 

if ($_GET['action']=='view'){ 

    viewcart(); 

} elseif ($_GET['action']=='add'){ 
    if (isset($_GET['product'])){ 
     $product_id = $_GET['product']; 
     $product_qty = 1; //default product value 
     addproduct($product_id, $product_qty); 
     viewcart(); 
     echo "<p><a href=\"javascript:history.go(-1)\">back</a></p>"; 
    } else { 
     echo "<p>There is an error! Are you trying to attack this little poor shopping cart?</p>"; 
    } 
} elseif ($_GET['action'] == 'delete'){ 
    if (isset($_GET['product'])){ 
     $product_id = $_GET['product']; 
     $product_qty = 1; //default product value 
     deleteproduct($product_id, $product_qty); 
     viewcart(); 
    } 
    else { 
     echo "<p>There is an error! </p>"; 
    } 
} elseif ($_GET['action']=='empty'){ 
    emptycart(); 
    viewcart(); 
} 

else { 
    echo "<p>There is an error! </p>"; 
} 
} 
else { 
    echo "<p>There is an error! </p>"; 
} 


include "footer.php"; 

?> 

Answer 1

您的查詢中有錯字。可能是你想提取產品的產品ID，但實際上在表中選擇了所有東西。

$q = "SELECT ID, Name FROM Products"; 

更新它，閱讀類似下面的例子中，檢查是否能解決此問題

$q = "SELECT ID, Name FROM `Products` WHERE name='$product' "; 

，以後你正在閱讀的結果作爲

$row = mysqli_fetch_array($result); 

我希望你知道那麼，這種方式$row將只獲得它從表中獲得的第一行。