我正在尝试将多个项目存储到一个会话中。我正在从这样的表格中发布一个项目：
<?php
$product_id = $_GET['product_id'];
$sql = "SELECT * FROM Products WHERE product_id = $product_id";
$result = $conn->query($sql);
if($result->num_rows > 0){
while($row = $result->fetch_assoc()){
echo '<img src=' . $row['product_img'] . ' />';
echo '<div class="title">'. $row['product_name'] .'</div>';
echo '<div class="title">'. $row['product_price'] .'</div>';
echo '<div class="title">'. $row['product_sku'] .'</div>';
echo '<div class="title">'. $row['product_description'] .'</div>';
echo '<form action="addToCart.php" method="post">
<input type="hidden" name="product_img" value="' . $row['product_img'] . '" />
<input type="hidden" name="product_id" value="' . $row['product_id'] . '" />
<input type="hidden" name="product_name" value="' . $row['product_name'] . '" />
<input type="hidden" name="product_price" value="' . $row['product_price'] . '" />
<input type="hidden" name="product_sku" value="' . $row['product_sku'] . '" />
<input type="hidden" name="product_description" value="' . $row['product_description'] . '" />
<input type="submit" name="Submit">
</form>';
}
} else{
echo "0 Results";
}
?>
addToCart.php如下：
<?php
if (isset($_POST['Submit'])) {
$_SESSION['product_img'] = $_POST['product_img'];
$_SESSION['product_id'] = $_POST['product_id'];
$_SESSION['product_name'] = $_POST['product_name'];
$_SESSION['product_price'] = $_POST['product_price'];
$_SESSION['product_sku'] = $_POST['product_sku'];
$_SESSION['product_description'] = $_POST['product_description'];
}
?>
因此，以上内容现在正在将项目设置到会话中（所以我相信）。然后，我从basket.php 中存储的数据中输出项目
<?php echo '<img src=' . $_SESSION['product_img'] . ' />'; ?>
<?php echo $_SESSION['product_id'];?>
<?php echo $_SESSION['product_name'];?>
<?php echo $_SESSION['product_price'] ?>
<?php echo $_SESSION['product_sku']; ?>
<?php echo $_SESSION['product_description']; ?>
我的问题是，每当我添加另一个项目时，它会覆盖上一个项目吗？我知道我需要使用一个数组来存储多个项目，但我尝试了一些不同的东西，但我很难理解。
您可以使用[]将它们存储在数组中：
$_SESSION['product_img'][] = $_POST['product_img'];
$_SESSION['product_id'][] = $_POST['product_id'];
$_SESSION['product_name'][] = $_POST['product_name'];
$_SESSION['product_price'][] = $_POST['product_price'];
$_SESSION['product_sku'][] = $_POST['product_sku'];
$_SESSION['product_description'][] = $_POST['product_description']
现在，试着看看每个阵列中都有什么：
var_dump($_SESSION['product_id']);
可以将会话数据存储为嵌套数组。在您的情况下，由于它是一辆购物车，您可能希望使用产品的ID构建阵列；这样你就可以确定没有产品会覆盖其他产品（只要它们没有相同的product_id值……下面是一个如何做到这一点的例子：
<?php
//FIRST CHECK IF SESSION EXIST BEFORE STARTING IT:
if (session_status() == PHP_SESSION_NONE || session_id() == '') {
session_start();
}
if (isset($_POST['Submit'])) {
$product_id = htmlspecialchars(trim($_POST['product_id']));
$product_img = htmlspecialchars(trim($_POST['product_img']));
$product_sku = htmlspecialchars(trim($_POST['product_sku']));
$product_name = htmlspecialchars(trim($_POST['product_name']));
$product_price = htmlspecialchars(trim($_POST['product_price']));
$product_description = htmlspecialchars(trim($_POST['product_description']));
if(!isset($_SESSION['products'])){
$_SESSION['products'] = array();
}
if(!isset($_SESSION['products'][$product_id])){
$_SESSION['products'][$product_id] = array();
}
$_SESSION['products'][$product_id]['product_id'] = $product_id;
$_SESSION['products'][$product_id]['product_img'] = $ $product_img;
$_SESSION['products'][$product_id]['product_name'] = $product_name;
$_SESSION['products'][$product_id]['product_price'] = $product_price;
$_SESSION['products'][$product_id]['product_sku'] = $product_sku;
$_SESSION['products'][$product_id]['product_description'] = $product_description;
}
在其他任何地方（也许是另一个脚本），你都可以访问你的数据，比如：
<?php
$output = "";
$storedProductData = $_SESSION['products'];
if(!empty($storedProductData)){
foreach($storedProductData as $product_id=>$productData){
$output .= "<img src='{$productData['product_img']}' />" . PHP_EOL;
$output .= "<span id='generic-class'>{$productData['product_id']}</span>" . PHP_EOL;
$output .= "<span id='generic-class'>{$productData['product_name']}</span>" . PHP_EOL;
$output .= "<span id='generic-class'>{$productData['product_price']}</span>" . PHP_EOL;
$output .= "<span id='generic-class'>{$productData['product_sku']}</span>" . PHP_EOL;
$output .= "<span id='generic-class'>{$productData['product_description']}</span>" . PHP_EOL;
}
}