来请教一个问题
咱在做一个购物车
购物车页面cart.php
<?php
define('ACCESE',1);
require('../init.php');
$_GET['gid'] = (int)$_GET['gid'];
$_GET['num'] = (int)$_GET['num'];
$goods = new goodsModel();
$goods->db();
$cart = cart::getCart();
switch($_GET['act']) {
//添加商品
case 'buy':{
$result = $goods->select_goods("g_id = $_GET[gid] and g_sale=1 and g_del=0");
$g = $goods->db->fetch_array($result);
//有此商品
if(!empty($g)) { //判断商品是否存在
if($g['g_no'] < $_GET['num']) { //判断库存
$type = 'error';
$msg = '放到购物车添加失败（可能是库存不足或者管理员私吞了）';
include(ROOT.'view/home/tip.html');
exit;
}
//商品存在
$cart->addItem("$g[g_id]","$g[g_name]","$g[g_price]","$_GET[num]"); //----------------------此行报错
} else {
$type = 'error';
$msg = '放到购物车添加失败（可能是下架、删除或者管理员私吞了）';
include(ROOT.'view/home/tip.html');
exit;
}
break;
}
}
$title = '购物车 - 商城系统';
$path = '购物车';
include(ROOT.'view/home/cart.html');
?>
<?php
defined('ACCESE') || EXIT('ACCESE DENIED');
class cart {
private static $ins = null;
private $items = array();
final protected function __construct() {
}
final protected function __clone() {
}
//获取实例
protected static function getIns() {
if(!(self::$ins instanceof self)) {
self::$ins = new self();
}
return self::$ins;
}
//把购物车的单例对象放到session里
public static function getCart() {
if(!isset($_SESSION['cart'])) {
$_SESSION['cart'] = self::getIns();
}
return $_SESSION['cart'];
}
//添加商品
public function addItem($id,$name,$price,$num=1) {
if($this->hasItem($id)) { // 如果商品已经存在 则直接增加数量
$this->incNum($id,$num);
return;
}
$item = array();
$item['name'] = $name;
$item['price'] = $price;
$item['num'] = $num;
$this->items[$id] = $item;
}
//修改购物车中的商品数量
public function modNum($id,$num=1) {
if(!$this->hasItem($id)) {
return false;
}
$this->items[$id]['num'] = $num;
}
//商品数量增加1
public function incNum($id,$num=1) {
if($this->hasItem($id)) {
$this->items[$id]['num'] += $num;
}
}
//商品数量减少1
public function decNum($id,$num=1) {
if($this->hasItem($id)) {
$this->items[$id]['num'] -= $num;
}
//数量为0 移除商品
if($this->items[$id]['num'] < 1) {
$this->delItem($id);
}
}
//判断某商品是否存在
public function hasItem($id) {
return array_key_exists($id,$this->items);
}
//删除商品
public function delItem($id) {
unset($this->items[$id]);
}
//查询购物车商品种类
public function getClass() {
return count($this->items);
}
//查询购物车商品个数
public function getNum() {
if($this->getClass() == 0) {
return 0;
}
$sum = 0;
foreach($this->items as $item) {
$sum += $item['num'];
}
return $sum;
}
//查询购物车商品总额
public function getPrice() {
if($this->getClass() == 0) {
return 0;
}
$price = 0.00;
foreach($this->items as $item) {
$price += $item['num'] * $item['price'];
}
return $price;
}
//返回购物车所有商品
public function all() {
return $this->items;
}
//清空购物车
public function clear() {
$this->items = array();
}
}
?>
<?php
//检测安全常量
defined('ACCESE') || EXIT('ACCESE DENIED');
//设置时区
date_default_timezone_set('prc');
//初始化绝对路径
define(ROOT,str_replace('\\','/',dirname(__FILE__)).'/');
//运行模式
error_reporting(E_ALL); //开发模式
//error_reporting(0); //部署模式
//安全转义
require(ROOT.'core/function/addslashes.func.php');
$_GET = _addslashes($_GET);
$_POST = _addslashes($_POST);
$_REQUEST = _addslashes($_REQUEST);
$_COOKIE = _addslashes($_COOKIE);
//自动加载模型和类
function __autoload($class) {
if(strtolower(substr($class,-5))=='model'){
include ROOT.'model/'.$class.'.class.php';
}
else{
include ROOT.'core/class/'.$class.'.class.php';
}
}
//开启session
if (!session_id()) session_start();
//加载弹窗函数
include(ROOT.'/core/function/dialog.func.php');
?>
