php+pdo实现的购物车类完整示例
本文实例讲述了php+pdo实现的购物车类。分享给大家供大家参考，具体如下：
<?php
session_start();
class Cart
{
public $pdo = null;
public function __construct($config)
{
$host = $config['host'];
$user = $config['user'];
$db = $config['db'];
$pwd = $config['pwd'];
if (empty($_SESSION['user_id'])) {
return show(0, '请先登录');
}
try {
$this->pdo = new PDO("mysql:host=$host;dbname=$db", "$user", "$pwd", array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
$this->pdo->query("set names utf8");
} catch (PDOException $e) {
echo $e->getMessage();
}
}
//添加商品到购物车
public function add_cart($productid, $num)
{
$sql = "select price from shop_product where id=?";
$stmt = $this->pdo->prepare($sql);
$stmt->execute(array($productid));
$data = $stmt->fetch(PDO::FETCH_ASSOC);
$price = $data['price'];
$createtime = time();
$sql = "select * from shop_cart where productid=? and userid=?";
$stmt = $this->pdo->prepare($sql);
$stmt->execute(array($productid, $_SESSION['user_id']));
$data = $stmt->fetch(PDO::FETCH_ASSOC);
if ($data) {
$sql = "update shop_cart set num=num+? where userid=? and productid=?";
$params = array($num, $_SESSION['user_id'], $productid);
} else {
$sql = "insert into shop_cart(productid,num,userid,price,createtime) values(?,?,?,?,?)";
$params = array($productid, $num, $_SESSION['user_id'], $price, $createtime);
}
$stmt = $this->pdo->prepare($sql);
$stmt->execute($params);
$rows = $stmt->rowCount();
return $rows ?
show(1, 'ok', $rows) :
show(0, 'fail');
}
//修改购买数量
public function change_num($productid, $num)
{
$sql = "update shop_cart set num=? where userid=? and productid=?";
$stmt = $this->pdo->prepare($sql);
$stmt->execute(array($num, $_SESSION['user_id'], $productid));
$rows = $stmt->rowCount();
return $rows ?
show(1, 'ok', $rows) :
show(0, 'fail');
}
//清空购物车
public function clear_cart()
{
$sql = "delete from shop_cart where userid=?";
$stmt = $this->pdo->prepare($sql);
$this->pdo->execute(array($this->user_id));
$rows = $stmt->rowCount();
return $rows ?
show(1, 'ok', $rows) :
show(0, 'fail');
}
//从购物车中删除商品
public function remove_cart($productid)
{
$sql = "delete from shop_cart where productid=? and userid=?";
$stmt = $this->pdo->prepare($sql);
$stmt->execute(array($productid, $_SESSION['user_id']));
$rows = $stmt->rowCount();
return $rows ?
show(1, 'ok', $rows) :
show(0, 'fail');
}
}
//处理数据
function show($status, $message, $data = array())
{
$result = array(
'status' => $status,
'message' => $message,
'data' => $data
);
exit(json_encode($result));
}
//简单使用
$user = [
'host' => '',
'user' => 'root',
'pwd' => 'root',
'db' => 'shop',
];
$productid = intval($_POST['productid']);
$num = intval($_POST['num']);
$cart = new Cart($user);
//添加到购物车
$cart->add_cart($productid, $num);
//删除指定的商品
$cart->remove_cart($productid);
//清空
$cart->clear_cart();
?>