Question

PHP对象存到数组里，数组在存到SESSION里面的问题

<?php
class CartItem {
public $name;
public $quantity;
public $price;
public $id;
public $desc;
public function getName() {
return $this->name;
}
public function setName($name) {
$this->name = $name;
}
public function getQuantity() {
return $this->name;
}
public function setQuantity($quantity) {
$this->quantity = $quantity;
}
public function getPrice() {
return $this->price;
}
public function setPrice($price) {
$this->price = $price;
}
public function getId() {
return $this->id;
}
public function setId($id) {
$this->id = $id;
}

public function getDesc() {
return $this->desc;
}
public function setDesc($desc) {
$this->desc = $desc;
}
}
?>

下面是购物类
<?php
session_start();
include ("CartItem.class.php");
$cart = array ();
global $cart;
$cart = $_SESSION['gouwu'];
$id = $_GET['id'];
$name = $_GET['name'];
$price = $_GET['price'];
$pin = new CartItem();
if ($cart == null) {
global $pin;
$pin->setId($id);
$pin->setName($name);
$pin->setPrice($price);
$str = new CartItem();
$str=serialize($pin);
$cart[] = $str;
$_SESSION['gouwu'] = $cart;
}
?>
<table>
<tr>
<td>商品</td><td>数量</td><td>价钱</td>
<?php
$obj = new CartItem();
global $obj;
//echo count($cart);
//for ($i = 0; $i < count($cart); $i++) {
// $obj=(object)$cart[$i];
foreach ($cart as $val) {
$s=unserialize($val);
?>
<tr><td><?=$s->getId() ?></td></tr>
<?php

}
?>
</tr>

错误Warning: unserialize() expects parameter 1 to be string, object given in D:\wamp\www\gouwuche\getshoppingcart.php on line 38 Fatal error: Call to a member function getId() on a non-object in D:\wamp\www\gouwuche\getshoppingcart.php on line 40

我把对象存到数组里，数组在存到SESSION里面，在从SESSION取数组，数组里面取对象。报的错误不知道怎么调请帮帮我
最好能帮忙修改下。万谢

Answer 1

session里面不能保存对象的！
因为session的初始化必须在脚本最开始，但那个时候类还没有被声明，所以无法使用其实例

Answer 2

unserialize 接受的是序列化后的字符串...

P.S. PHP3之后,SESSION就能保存对象或数组了... 前提是能序列化

Answer 3

错误提示已经写的很清楚了，unserialize函数的参数必须是字符串，你var_dump一下你的$val，看它是不是字符串，如果不是的话，就先serialize一下啊

Answer 4

怎么这么繁琐。。。。。。。。。。。