An example of php shopping cart class implementation code

// Shopping cart class
/*
Instructions for use:
Constructor cart can use parameters:
cart($cartname = 'myCart', $session_id = '', $savetype = 'session', $cookietime = 86400, $cookiepath = '/', $cookiedomain = '')
$cartname is the identification of the shopping cart, which can be specified to ensure that there is no duplicate name and no related conflicts
$ session_id is the session_id. The default is to use cookies to transmit. It can also be customized. It will only work if the storage type is session. $savetype storage type, there are session and cookie methods.
... Others are parameters required by cookies
When the program itself uses session, it is recommended to change this php shopping cart class to cookie implementation.
//Add a product
// Reference class
require_once './cart.class.php';
// Create class instance
$cart = new cart(); p>
// The product already has modified data
if ($cart->data[$id]) {
$cart->data[$id]['count'] += $count;
$cart->data[$id]['money'] += $cart->data[$id]['price'] * $count;
// Add product
} else {
$cart- >data[$id]['name'] = $name;
$cart->data[$id]['price'] = $price;
$cart->data[$id]['count '] = $count;
$cart->data[$id]['money'] = $price * $count;
}
// Save shopping cart data
$cart->save();
Edit a product quantity
// Reference class
require_once './cart.class.php';
// Create a class instance
$cart = new cart();
 // The product already has modified data
if ($cart->data[$id]) {
$cart->data[$id]['count'] = $count;
$cart- >data[$id]['money'] = $cart->data[$id]['price'] * $count;
// Save shopping cart data
$ cart->save();
}
Delete a product
// Reference class
require_once './cart.class.php';
// Create class instance
$cart = new cart();
// Delete items
unset($cart->data[$id]);
// Save shopping cart data
$cart->save();
List shopping cart
// Reference class
require_once './cart.class.php';
// Create class instance
$cart = new cart();
foreach ($cart->data AS $k => $v) {
echo 'Product ID: '.$k;
echo 'Product name: '.$v['name'];
echo 'Unit price of product: '.$v['price'];
echo 'Quantity of product: '.$v['count'];
echo 'Total price of product: ' .$v['money'];
}
The total accumulation of a certain field---such as the total price of all products
// Reference class
require_once './cart.class.php';
// Create a class instance
$cart = new cart();
// Accumulate money field
$cart->sum('money')
Clear shopping cart
// Reference class
require_once './cart.class.php';
// Create class instance
$cart = new cart();
// Clear Data
unset($cart->data);
// Save shopping cart data
$cart->save();
*/
//edit bbs.it-home.org
class cart {
// Shopping cart identifier
var $cartname = '';
// Storage type
 var $savetype = '';
// Product data in the shopping cart
var $data = array();
// Cookie data
var $cookietime = 0;
var $cookiepath = '/';
var $cookiedomain = '';
// Constructor (shopping cart ID, $session_id, storage type (session or cookie), default is time of day, $cookiepath, $cookiedomain)
function cart($cartname = 'myCart', $session_id = '', $savetype = 'session', $cookietime = 86400, $cookiepath = '/', $cookiedomain = '') {
// Adopt session storage
if ($savetype == 'session') {
if (!$session_id && $_COOKIE[$cartname.'_session_id']) {
session_id($_COOKIE[$cartname .'_session_id']);
} elseif($session_id)
session_id($session_id);
session_start();
if (!$session_id && !$_COOKIE[$cartname.'_session_id'])
setcookie($cartname.'_session_id', session_id(), $cookietime + time(), $cookiepath, $cookiedomain);
}
< ;p>$this->cartname = $cartname;
$this->savetype = $savetype;
$this->cookietime = $cookietime;
$this->cookiepath = $cookiepath;
$this- >cookiedomain = $cookiedomain;
$this->readdata();
}
// Read data
function readdata() {
if ($this->savetype = = 'session') {
if ($_SESSION[$this->cartname] && is_array($_SESSION[$this->cartname]))
$this->data = $_SESSION[$this-> cartname];
else
$this->data = array();
} elseif ($this->savetype == 'cookie') {
if ($_COOKIE[$this->cartname])
$ this->data = unserialize($_COOKIE[$this->cartname]);
else
$this->data = array();
}
}
// Save shopping cart data
function save() {
if ($this->savetype == 'session') {
$_SESSION[$this->cartname] = $this->data;
}elseif ($this->savetype == 'cookie') {
if ($this->data)
setcookie($this->cartname, serialize($this->data), $this->cookietime + time(), $this->cookiepath, $this->cookiedomain);
}
}
// 返回商品某字段累加
function sum($field) {
$sum = 0;
if ($this->data)
foreach ($this->data AS $v)
if ($v[$field])
$sum += $v[$field] + 0;
return $sum;
}
}
?>