php 購物車類別的實作代碼(單例模式)-php教程-PHP中文網

php 購物車類別的實作代碼(單例模式)

WBOY

發布： 2016-07-25 08:59:33

原創

881 人瀏覽過

/**
* php 购物车类
* 单例模式
* Edit bbs.it-home.org
*/
class Cart{
static protected $ins; //实例变量
protected $item = array(); //放商品容器
//禁止外部调用
final protected function __construct(){
}
//禁止克隆
final protected function __clone(){
}
//类内部实例化
static protected function Getins(){
if(!(self::$ins instanceof self)){
self::$ins = new self();
}
return self::$ins;
}
//为了能使商品跨页面保存，把对象放入session里
public function Getcat(){
if(!($_SESSION['cat']) || !($_SESSION['cat'] instanceof self)){
$_SESSION['cat'] = self::Getins();
}
return $_SESSION['cat'];
}
//入列时的检验，是否在$item里存在.
public function Initem($goods_id){
if($this->Gettype() == 0){
return false;
}
if(!(array_key_exists($goods_id,$this->item))){
return false;
}else{
return $this->item[$goods_id]['num']; //返回此商品个数
}
}
//添加一个商品
public function Additem($goods_id,$name,$num,$price){
if($this->Initem($goods_id) != false){
$this->item[$goods_id]['num'] += $num;
return;
}
$this->item[$goods_id] = array(); //一个商品为一个数组
$this->item[$goods_id]['num'] = $num; //这一个商品的购买数量
$this->item[$goods_id]['name'] = $name; //商品名字
$this->item[$goods_id]['price'] = $price; //商品单价
}
//减少一个商品
public function Reduceitem($goods_id,$num){
if($this->Initem($goods_id) == false){
return;
}
if($num > $this->Getunm($goods_id)){
unset($this->item[$goods_id]);
}else{
$this->item[$goods_id]['num'] -=$num;
}
}
//去掉一个商品
public function Delitem($goods_id){
if($this->Initem($goods_id)){
unset($this->item[$goods_id]);
}
}
//返回购买商品列表
public function Itemlist(){
return $this->item;
}
//一共有多少种商品
public function Gettype(){
return count($this->item);
}
//获得一种商品的总个数
public function Getunm($goods_id){
return $this->item[$goods_id]['num'];
}
// 查询购物车中有多少个商品
public function Getnumber(){
$num = 0;
if($this->Gettype() == 0){
return 0;
}
foreach($this->item as $k=>$v){
$num += $v['num'];
}
return $num;
}
//计算总价格
public function Getprice(){
$price = 0;
if($this->Gettype() == 0){
return 0;
}
foreach($this->item as $k=>$v){
$price += $v['num']*$v['num'];
}
return $price;
}
//清空购物车
public function Emptyitem(){
$this->item = array();
}
}
?>

复制代码

调用示例：

include_once('Cart.php');
$cart = Cart::Getcat();
$cart->Additem('1','php学习教程(程序员之家版)','5','9999');
print_r($cart);
?>

复制代码