我已成功将商品添加到购物车。但是，我无法添加它的数量。我知道问题出在 addtocart 中的某个地方，我无法将索引中的值传递到下一页。我对此仍然是初学者，所以我不知道如何解决这个问题。我尝试过使用 session ，但仍然不起作用
这是我在index.php中的代码:
<html>
<head>
<meta charset="UTF-8">
<title>Innisnotfree</title>
</head>
<body>
<?php
session_start();
include'header.php';
include'nav.php';
include "connection.php";
$sql = "SELECT * FROM products";
$res = mysqli_query($connection, $sql);
?>
<div class="container">
<div class="row">
<?php while($r = mysqli_fetch_assoc($res)){ ?>
<div class="col-sm-6 col-md-3">
<div class="thumbnail">
<img src="<?php echo $r['image'];?>" alt="<?php echo $r['title']?>">
<div class="caption">
<form name="form1" id="form1" method="POST" action="addtocart.php?id=<?php echo $r['id']?>">
<h3><?php echo $r['title']?></h3>
<p> <?php echo $r['description']?></p>
<p><?php echo $r['price']?></p>
<p><input type="number" name="quantity" id="quantity" class="form-control"/></p>
<p><input type="submit" name="add_to_cart" id="add_to_cart" style="margin-top:5px;" class="btn btn-success" value="Add to Cart"/></p>
</form>
</div>
</div>
</div>
<?php } ?>
</div>
</div>
<?php include('footer.php')?>
</body>
</html>这是我的 addtocart.php
<?php
session_start();
if(isset($_SESSION['cart']) & !empty($_SESSION['cart'])){
$items = $_SESSION['cart'];
$cartitems = explode(",", $items);
$items .= "," . $_GET['id'];
if($_SERVER["REQUEST_METHOD"]=="POST"){
$quantity = $_POST["quantity"];}
header('location: index.php?status=success');
}else{
$items = $_GET['id'];
$_SESSION['cart'] = $items;
if($_SERVER["REQUEST_METHOD"]=="POST"){
$_POST["quantity"] = $quantity ;}
header('location: index.php?status=success');
}
?>这是我的 cart.php:
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<?php
session_start();
require_once('connection.php');
include('header.php');
include('nav.php');
$items = $_SESSION['cart'];
if($_SERVER["REQUEST_METHOD"]=="POST"){
$quantity = $_POST["quantity"];
}
$cartitems = explode(",", $items);
?>
<div class="container">
<div class="row">
<table class="table">
<tr>
<th>S.NO</th>
<th>Item Name</th>
<th>Quantity</th>
<th>Price </th>
</tr>
<?php
$total = 0;
$i =1;
foreach ($cartitems as $key=>$id){
$sql = "SELECT * FROM products WHERE id = $id";
$res= mysqli_query($connection, $sql);
if(empty($_SESSION['cart'])){
$r = 0;
}
else{
$r = mysqli_fetch_assoc($res);
}
?>
<tr>
<td><?php echo $i; ?></td>
<td><a href="delcart.php?remove=<?php echo $key; ?>">Remove</a><?php echo $r['title'];?></td>
<td><?php if($_SERVER["REQUEST_METHOD"]=="POST"){echo $_POST["quantity"];};?></td>
<td>$<?php echo $r['price'];?></td>
</tr>
<?php
$total = $total + $r['price'];
$i++;
}
?>
<tr>
<td><strong>Total Price</strong></td>
<td><strong>$<?php echo $total; ?></strong></td>
<td><a href="#" class="btn btn-info">Checkout</a></td>
</tr>
</table>
</div>
</div>
<?php
include 'footer.php';
?>
</body>
</html>最佳答案
查看我的购物车类，您可以根据需要进行修改
class cart {
/**
* add product to cart by id and quantity
* @param type $pid product id
* @param type $quantity
*/
function add($pid,$quantity){
/*if cart dosen't exist initialize it and add the first product*/
if(!isset($_SESSION['cart'])){
$_SESSION['cart']=array();
$_SESSION['cart'][0]['productid']=$pid;
$_SESSION['cart'][0]['quantity']=$quantity;
echo 'Product successfully added';
}
/*else if cart exist check if product exist to change quantity else add new product*/
else {
/*if exist change quantity*/
if($this->isexist($pid,$quantity)){
echo 'Quantity updated successfully';
}
/*else add new product in cart*/
else{
$m=$_SESSION['cart'];
$max=count($m);
$_SESSION['cart'][$max]['productid']=$pid;
$_SESSION['cart'][$max]['quantity']=$quantity;
echo 'Product successfully added';
}
}
}
/**
* check if product alredy exist in cart or not
* @param type $pid product id
* @param type $quantity
* @return boolean if true the product is exist and the quantity change successfully
*/
function isexist($pid,$quantity) {
$m=$_SESSION['cart'];
$max=count($m);
for($i=0;$i<$max;$i++){
if($pid==$_SESSION['cart'][$i]['productid']){
$_SESSION['cart'][$i]['quantity']=$quantity;
return true;
}
}
return false;
}
/**
* delete product by product id
* @param type $pid product id
*/
function delete($pid){
$m=$_SESSION['cart'];
$max=count($m);
for($i=0;$i<$max;$i++){
if($pid==$_SESSION['cart'][$i]['productid']){
unset($_SESSION['cart'][$i]);
$_SESSION['cart']=array_values($_SESSION['cart']);$_SESSION['cart'.'num']-=1;break;
}
}
}
/**
* change quantity of exist product
* @param type $pid product id
* @param type $quantity
*/
function modify($pid,$quantity){
$m=$_SESSION['cart'];
$max=count($m);
if($quantity>0){
for($i=0;$i<$max;$i++){
if($pid==$_SESSION['cart'][$i]['productid']){
$_SESSION['cart'][$i]['quantity']=$quantity;break;
}
}
}
else {$this->delete($pid);}
}
/**
* show all items in your cart
*/
function show_cart() {
$max=count($_SESSION['cart']);
for($i=0;$i<$max;$i++){
echo 'id=>'.$_SESSION['cart'][$i]['productid'].
'quantity=>'.$_SESSION['cart'][$i]['quantity'].'<br>';
}
}
}
关于javascript - 我怎样才能在这个购物车php中插入数量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47842589/