php用session实现购物车的方法：首先创建前端代码实现加入购物车动作；然后在PHP文件中实现购物车数据的逻辑判断；接着根据数据加载列表；最后通过unset等函数实现商品的删除或金额计算即可。
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PHP 使用session实现购物车效果（点击按钮添加数据，根据数据生成列表，删除选中的商品，点击按钮时计算金额）
代码很多，截取一部分
// 加入购物车
function addshopping() {
<?php
$db = db($_GET['db']);
$id = $formatData['id'];
$user = $formatData['user'];
// 当购物车没有时，即没有session数据时
if (empty($_SESSION['gwc'])) {
$arr = array(array('user' => $user, 'db' => $db, 'id' => $id, 'num' => 1));
$_SESSION['gwc'] = $arr;
} else {
// 当购物车有数据时
$arr = $_SESSION["gwc"];
$order = false;
foreach ($arr as $key => $value) {
// 如果数据中有了这个数据
if ($value['user'] == $user && $value['db'] == $db && $value['id'] == $id) {
$index = $key; //保存这个相同数据的下标，以便操作
$order = true;
//定义一个变量，看是佛有相同的数据，需要注意的是，不能再这个if语句中else，否则后面的语句
//虽然会使数量加一，但是还是会多创建一条数据，为什么，自己想想就能明白，只是当时当局者迷
}
}
if ($order) {
// 如果该商品在购物车存在，让数量加1
$arr[$index]['num']++;
} else {
// 如果该商品购物车里面不存在，造一个一维数组扔到二维里面
$arr[] = array('user' => $user, 'db' => $db, 'id' => $id, 'num' => 1);
}
$_SESSION["gwc"] = $arr;
}
?>
console.log('addshopping');
} <!-- 购物车列表 -->
<?php
foreach ($_SESSION['gwc'] as $dataList) {
$clean = array();
$clean['user'] = $dataList['user'];
$clean['db'] = $dataList['db'];
$clean['id'] = $dataList['id'];
$clean['num'] = $dataList['num'];
$res = $conn->fetchRow("SELECT * FROM {$clean['db']} WHERE id={$clean['id']}");
$clean['title'] = $res['title'];
$clean['price'] = $res['price'];
$clean['face'] = $res['face'];
?>
<p class="weui-content">
<p class="weui-panel weui-panel_access">
<p class="weui-panel__hd"><span><?php echo $clean['user']; ?> </span><a href="javascript:void(0)" class="wy-dele"><!-- 删除 --></a></p>
<p class="weui-panel__bd">
<p class="weui-media-box_appmsg pd-10">
<p class="weui-media-box__hd check-w weui-cells_checkbox">
<label class="weui-check__label" for="cart-<?php echo $clean['db'] . '-' . $clean['id'] ?>">
<p class="weui-cell__hd cat-check">
<input type="checkbox" class="weui-check" name="cartpro" id="cart-<?php echo $clean['db'] . '-' . $clean['id'] ?>"><i class="weui-icon-checked"></i>
</p>
</label>
</p>
<p class="weui-media-box__hd"><a href="pro_info.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id']; ?>"><img class="weui-media-box__thumb" src="<?php echo $clean['face']; ?>" alt="" style="height: 100%"></a></p>
<p class="weui-media-box__bd">
<h1 class="weui-media-box__desc"><a href="pro_info.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id']; ?>" class="ord-pro-link"><?php echo $clean['title']; ?></a></h1>
<p class="weui-media-box__desc">规格：<span>红色</span>，<span>23</span></p>
<p class="clear mg-t-10">
<p class="wy-pro-pri fl">¥<em class="num font-15 price"><?php echo $clean['price']; ?></em></p>
<p class="pro-amount fr">
<!-- 购买的数量 -->
<input type="hidden" name="" class="datanum" value="<?php echo $clean['num']; ?>">
<!-- 提交删除的数据 -->
<input type="hidden" name="" class="rmdata" value="shopping.php?db=<?php echo $clean['db']; ?>&id=<?php echo $clean['id'];?>">
<p class="Spinner"></p>
</p>
</p>
</p>
</p>
</p>
</p>
</p>
<?php }
?>// echo '<pre class="brush:php;toolbar:false">';// print_r($_SESSION['gwc']);// echo '';if(isset($_GET['db']) && isset($_GET['id'])){ $dataArr = $_SESSION['gwc']; foreach ($dataArr as $key => $value) { if($value['db'] == $_GET['db'] && $value['id'] == $_GET['id']){ unset($dataArr[$key]); } } $_SESSION['gwc'] = $dataArr; header("Location:shopping.php");}// echo '
';// print_r( $dataArr);// echo '';
<!-- 金额计算 -->
<script>
window.onload = function() {
var cartproAll = document.querySelectorAll('input[name=cartpro]');
var datanum = document.querySelectorAll('.datanum');
var numAll = document.querySelectorAll('.Amount');
var DisDe = document.querySelectorAll('.DisDe');
var Increase = document.querySelectorAll('.Increase');
// 购买数量的多少
numAll.forEach((item,i) => {
item.value = datanum[i].value;
})
// 点击加号
DisDe.forEach((item, i) => {
item.onclick = function() {
computedPrice();
}
})
// 点击减号
Increase.forEach((item, i) => {
item.onclick = function() {
computedPrice();
}
})
// 点击单选时计算金额
cartproAll.forEach((item, i) => {
item.onclick = function() {
computedPrice();
}
})
}
function computedPrice(){
var cartproAll = document.querySelectorAll('input[name=cartpro]'); //获取是否点击
var price = document.querySelectorAll('.price'); //价钱
var price_total = document.querySelector('.price_total'); //价钱总数
var numAll = document.querySelectorAll('.Amount'); //数量
var total = 0;
price_total.innerHTML = 0;
cartproAll.forEach((item, i) => {
if (item.checked == true) {
total += parseFloat(price[i].innerHTML) * parseFloat(numAll[i].value);
}
})
price_total.innerHTML = total;
}
</script>
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