<?php
/**
* 购物车类
* 功能：
* 添加商品
* 删除商品
* 商品列表
* 查看商品
* 商品+1
* 商品-1
* 商品种类
* 商品个数
* 商品小计
* 商品总计
*/
class cart{
protected static $ins = null;
protected $basket;
protected function __construct(){
}
protected static function getIns(){
if (self::$ins == null) {
# code...
self::$ins = new self();
}
return self::$ins;
}
/**/
public static function getCar(){
if( !isset($_SESSION['car']) || !($_SESSION['car'] instanceof self) ){
$_SESSION['car'] = self::getIns();
}
return $_SESSION['car'];
}
/**
* 添加商品
*/
public function addItems($goods_id,$goods_name,$shop_price,$goods_num,$goods_thumb){
/*判断id是否存在*/
if (!$this->hasItems($goods_id)) {
# code...
$this->basket[$goods_id] = array(
'goods_id'=>$goods_id,
'goods_name'=>$goods_name,
'shop_price'=>$shop_price,
'goods_num'=>$goods_num,
'goods_thumb'=>$goods_thumb
);
}else{
$this->basket[$goods_id]['goods_num'] += $goods_num;
}
}
/**
* 删除一种商品
*/
public function delItems($goods_id){
if ($this->hasItems($goods_id)) {
unset($this->basket[$goods_id]);
}
}
protected function hasItems($goods_id){
return array_key_exists($goods_id,$this->basket);
}
/**
* 列出商品
*/
public function listItems(){
return $this->basket;
}
/**
* 清空购物车
*/
public function clear(){
$this->basket = array();
}
/**
* 计算商品种类
*/
public function cnt(){
return count($this->basket);
}
/**
* 计算商品个数
*/
public function getCount(){
$count = 0;
if (empty($this->basket)) {
# code...
return $count;
}
foreach ($this->basket as $v) {
# code...
$count += $v['goods_num'];
}
return $count;
}
/**
* 计算商品总价格
*/
public function getPrice(){
$total = 0;
if (empty($this->basket)) {
# code...
return $total;
}
foreach ($this->basket as $v) {
# code...
$total += $v['shop_price']*$v['goods_num'];
}
return $total;
}
/**
* 修改商品数量
*/
public function upItems($goods_id){
if(!$this->hasItems($goods_id)){
return '你的商品id号不存在';
}else if($this->basket[$goods_id]['goods_num'] <= 0){
$this->delItems($goods_id);
}else{
$this->basket[$goods_id]['goods_num'] = $goods_num;
}
}
/**
* 商品数量+1
*/
public function addOne($goods_id){
if(!$this->hasItems($goods_id)){
return '你的商品id号不存在';
}else{
$this->basket[$goods_id]['goods_num'] += 1;
}
}
/**
* 商品数量-1
*/
public function delOne($goods_id){
if(!$this->hasItems($goods_id)){
return '你的商品id号不存在';
}else{
$this->basket[$goods_id]['goods_num'] -= 1;
}
}
}
?>
