我正在开发一个基本的购物车。但是，$_SESSION 变量似乎未正确存储或访问。例如，如果您前往它将显示项目名称。但是在没有任何 $_GET 变量的情况下刷新 cart.php 时，它不会返回任何内容。我究竟做错了什么？
<?php
include "tickets/config.php";
if (isset ($_GET['action']) && isset($_GET['item'])) {
$cart = new Cart($_GET['item']);
if ($_GET['action'] == "addItem") {
$cart->addItem();
$cart->get_items_code();
$cart->populate();
}
if($_GET['action'] == "removeItem") {
$cart->removeItem();
$cart->get_items_code();
$cart->populate();
}
$cart->postAllItems();
}
else {
$cart = new Cart(null);
$cart->get_items_code();
$cart->populate();
$cart->postAllItems();
}
class Cart {
protected $all_items = array();
protected $request_item;
protected $content;
protected $item_obj;
public function __construct($request_item) {
$this->request_item = $request_item;
if ($this->request_item)
$this->item_obj = new Item($this->request_item);
$this->all_items = $this->getAllItems();
}
public function getAllItems() {
if ($_SESSION['cart'])
$request = $_SESSION['cart'];
else
$request = array();
return $request;
}
public function postAllItems() {
$_SESSION['cart'] = $this->all_items;
}
public function addItem () {
array_push($this->all_items, $this->item_obj);
}
public function removeItem() {
unset($this->all_items[$this->item_obj->get_item()]);
}
public function get_items_code() {
//for($i = 0; $this->all_items[$i]; $i++) {
foreach($this->all_items as $item) {
$name = $item->get_name();
$this->content .= <<<HTML
<div class="item">
$name
</div>
HTML;
}
}
public function populate() {
echo <<<HTML
<div id="list">
$this->content
<div>
HTML;
}
}
class Item {
protected $id;
protected $name;
protected $price;
protected $desc;
protected $colors;
protected $sizes;
protected $pic_url;
protected $all_info;
public function __construct($id) {
$this->id = $id;
$this->get_item_info();
}
public function get_item() {
return ($this);
}
public function get_name() {
return $this->name;
}
protected function get_item_info() {
$sql = "SELECT * FROM catalog WHERE id = ".$this->id;
$this->all_info = mysql_query($sql);
$this->all_info = mysql_fetch_array($this->all_info);
$this->name = $this->all_info['name'];
$this->price = $this->all_info['price'];
$this->desc = $this->all_info['description'];
$this->colors = $this->all_info['colors'];
$this->sizes = $this->all_info['sizes'];
$this->pic_url = $this->all_info['picture'];
}
}
?>
您需要使用以下命令初始化会话session_start()-功能 http://php.net/session_start在页面顶部（在修改或读取会话内容之前）。
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