Question

我正在开发一个基本的购物车。但是，似乎$ _SESSION变量未正确存储或访问。例如，如果您前往here，它将显示项目名称。但是在没有任何$ _GET变量的刷新到cart.php时它什么都不返回。我做错了什么？

<?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'];
    }

}




?>

Answer 1

您需要使用页面顶部的session_start()-function初始化会话（在修改或读取会话内容之前）。

Answer 2

您的代码看起来很好，但您必须在每个修改会话或从会话读取的页面上调用session_start（）。只需将其放在页面顶部即可。

session_start();

Answer 3

我最近还遇到了一个问题，$ _SESSION vars在页面重定向后维护自己，这可能是你的问题。

会话变量无法在从http://www.example.com重定向到http://example.com重定向后继续存在。因此，您使用具有相对路径或绝对路径的重定向，但不使用网站名称进行重定向：

使用

header('Location: /new_page.php');

而不是

header('Location: http://www.exmple.com/new_page.php')

也许这里不适用，但确实让我感到很沮丧。

购物车$ _SESSION问题

3 个答案: