PHP购物车类代码

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

<?php<br />header("Content-type:text/html;charset=utf-8");<br />session_start();<br />$cart = Cart::Getcat();<br />$cart->Additem('1','www.phpernote.com','1','1亿');<br />$cart->Additem('2','php购物车类','3','10');<br />print_r($cart);