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購物車$ _SESSION問題

[英]Shopping Cart $_SESSION Problem

我正在使用基本的購物車。 但是,似乎$ _SESSION變量未正確存儲或訪問。 例如,如果您前往這里 ,它將顯示商品名稱。 但是在刷新沒有任何$ _GET變量的cart.php時,它什么也不返回。 我究竟做錯了什么?

<?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'];
    }

}




?>

您需要使用頁面頂部的session_start() -函數初始化會話(在修改或讀取會話內容之前)。

您的代碼看起來不錯,但是您必須在修改會話或從會話讀取的每個頁面上調用session_start()。 只需將其放在頁面頂部即可。

session_start();

最近,我也遇到了$ _SESSION變量在頁面重定向后自行維護的問題,這可能是您的問題。

http://www.example.com重定向到http://example.com重定向后,會話變量將無法生存。 因此,您可以使用具有相對路徑或絕對路徑的重定向,但不要使用站點名稱:

采用

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

相對於

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

也許這里不適用,但確實使我絆倒了很多。

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