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发表于 2009-4-11 16:15:37
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PHP复制代码 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 4.3.2 or newer
*
* @package CodeIgniter
* @author ExpressionEngine Dev Team
* @copyright Copyright (c) 2006 - 2009, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* Shopping Cart Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Shopping Cart
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/libraries/cart.html
*/
class CI_Cart {
// These are the regular expression rules that we use to validate the product ID and product name
var $product_id_rules = '\.a-z0-9_-'; // alpha-numeric, dashes, underscores, or periods
var $product_name_rules = '\.\:\-_ a-z0-9'; // alpha-numeric, dashes, underscores, colons or periods
// Private variables. Do not change!
var $CI;
var $_cart_contents = array();
/**
* Shopping Class Constructor
*
* The constructor loads the Session class, used to store the shopping cart contents.
*/
function CI_Cart ($params = array())
{
// Set the super object to a local variable for use later
$this->CI =& get_instance ();
// Are any config settings being passed manually? If so, set them
$config = array();
if (count($params) > 0)
{
foreach ($params as $key => $val)
{
$config[$key] = $val;
}
}
// Load the Sessions class
$this->CI->load->library('session', $config);
// Grab the shopping cart array from the session table, if it exists
if ($this->CI->session->userdata('cart_contents') !== FALSE)
{
$this->_cart_contents = $this->CI->session->userdata('cart_contents');
}
else
{
// No cart exists so we'll set some base values
$this->_cart_contents ['cart_total'] = 0;
$this->_cart_contents ['total_items'] = 0;
}
log_message ('debug', "Cart Class Initialized");
}
// --------------------------------------------------------------------
/**
* Insert items into the cart and save it to the session table
*
* @access public
* @param array
* @return bool
*/
function insert ($items = array())
{
// Was any cart data passed? No? Bah...
if ( ! is_array($items) OR count($items) == 0)
{
log_message ('error', 'The insert method must be passed an array containing data.');
return FALSE;
}
// You can either insert a single product using a one-dimensional array,
// or multiple products using a multi-dimensional one. The way we
// determine the array type is by looking for a required array key named "id"
// at the top level. If it's not found, we will assume it's a multi-dimensional array.
$save_cart = FALSE;
if (isset($items['id']))
{
if ($this->_insert ($items) == TRUE)
{
$save_cart = TRUE;
}
}
else
{
foreach ($items as $val)
{
if (is_array($val) AND isset($val['id']))
{
if ($this->_insert ($val) == TRUE)
{
$save_cart = TRUE;
}
}
}
}
// Save the cart data if the insert was successful
if ($save_cart == TRUE)
{
$this->_save_cart ();
return TRUE;
}
return FALSE;
}
// --------------------------------------------------------------------
/**
* Insert
*
* @access private
* @param array
* @return bool
*/
function _insert ($items = array())
{
// Was any cart data passed? No? Bah...
if ( ! is_array($items) OR count($items) == 0)
{
log_message ('error', 'The insert method must be passed an array containing data.');
return FALSE;
}
// --------------------------------------------------------------------
// Does the $items array contain an id, quantity, price, and name? These are required
if ( ! isset($items['id']) OR ! isset($items['qty']) OR ! isset($items['price']) OR ! isset($items['name']))
{
log_message ('error', 'The cart array must contain a product ID, quantity, price, and name.');
return FALSE;
}
// --------------------------------------------------------------------
// Prep the quantity. It can only be a number. Duh...
$items['qty'] = trim(preg_replace('/([^0-9])/i', '', $items['qty']));
// Trim any leading zeros
$items['qty'] = trim(preg_replace('/(^[0]+)/i', '', $items['qty']));
// If the quantity is zero or blank there's nothing for us to do
if ( ! is_numeric($items['qty']) OR $items['qty'] == 0)
{
return FALSE;
}
// --------------------------------------------------------------------
// Validate the product ID. It can only be alpha-numeric, dashes, underscores or periods
// Not totally sure we should impose this rule, but it seems prudent to standardize IDs.
// Note: These can be user-specified by setting the $this->product_id_rules variable.
if ( ! preg_match("/^[".$this->product_id_rules."]+$/i", $items['id']))
{
log_message ('error', 'Invalid product ID. The product ID can only contain alpha-numeric characters, dashes, and underscores');
return FALSE;
}
// --------------------------------------------------------------------
// Validate the product name. It can only be alpha-numeric, dashes, underscores, colons or periods.
// Note: These can be user-specified by setting the $this->product_name_rules variable.
if ( ! preg_match("/^[".$this->product_name_rules."]+$/i", $items['name']))
{
log_message ('error', 'An invalid name was submitted as the product name: '.$items['name'].' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');
return FALSE;
}
// --------------------------------------------------------------------
// Prep the price. Remove anything that isn't a number or decimal point.
$items['price'] = trim(preg_replace('/([^0-9\.])/i', '', $items['price']));
// Trim any leading zeros
$items['price'] = trim(preg_replace('/(^[0]+)/i', '', $items['price']));
// Is the price a valid number?
if ( ! is_numeric($items['price']))
{
log_message ('error', 'An invalid price was submitted for product ID: '.$items['id']);
return FALSE;
}
// --------------------------------------------------------------------
// We now need to create a unique identifier for the item being inserted into the cart.
// Every time something is added to the cart it is stored in the master cart array.
// Each row in the cart array, however, must have a unique index that identifies not only
// a particular product, but makes it possible to store identical products with different options.
// For example, what if someone buys two identical t-shirts (same product ID), but in
// different sizes? The product ID (and other attributes, like the name) will be identical for
// both sizes because it's the same shirt. The only difference will be the size.
// Internally, we need to treat identical submissions, but with different options, as a unique product.
// Our solution is to convert the options array to a string and MD5 it along with the product ID.
// This becomes the unique "row ID"
if (isset($items['options']) AND count($items['options']) > 0)
{
$rowid = md5($items['id'].implode('', $items['options']));
}
else
{
// No options were submitted so we simply MD5 the product ID.
// Technically, we don't need to MD5 the ID in this case, but it makes
// sense to standardize the format of array indexes for both conditions
$rowid = md5($items['id']);
}
// --------------------------------------------------------------------
// Now that we have our unique "row ID", we'll add our cart items to the master array
// let's unset this first, just to make sure our index contains only the data from this submission
unset($this->_cart_contents [$rowid]);
// Create a new index with our new row ID
$this->_cart_contents [$rowid]['rowid'] = $rowid;
// And add the new items to the cart array
foreach ($items as $key => $val)
{
$this->_cart_contents [$rowid][$key] = $val;
}
// Woot!
return TRUE;
}
// --------------------------------------------------------------------
/**
* Update the cart
*
* This function permits the quantity of a given item to be changed.
* Typically it is called from the "view cart" page if a user makes
* changes to the quantity before checkout. That array must contain the
* product ID and quantity for each item.
*
* @access public
* @param array
* @param string
* @return bool
*/
function update ($items = array())
{
// Was any cart data passed?
if ( ! is_array($items) OR count($items) == 0)
{
return FALSE;
}
// You can either update a single product using a one-dimensional array,
// or multiple products using a multi-dimensional one. The way we
// determine the array type is by looking for a required array key named "id".
// If it's not found we assume it's a multi-dimensional array
$save_cart = FALSE;
if (isset($items['rowid']) AND isset($items['qty']))
{
if ($this->_update ($items) == TRUE)
{
$save_cart = TRUE;
}
}
else
{
foreach ($items as $val)
{
if (is_array($val) AND isset($val['rowid']) AND isset($val['qty']))
{
if ($this->_update ($val) == TRUE)
{
$save_cart = TRUE;
}
}
}
}
// Save the cart data if the insert was successful
if ($save_cart == TRUE)
{
$this->_save_cart ();
return TRUE;
}
return FALSE;
}
// --------------------------------------------------------------------
/**
* Update the cart
*
* This function permits the quantity of a given item to be changed.
* Typically it is called from the "view cart" page if a user makes
* changes to the quantity before checkout. That array must contain the
* product ID and quantity for each item.
*
* @access private
* @param array
* @return bool
*/
function _update ($items = array())
{
// Without these array indexes there is nothing we can do
if ( ! isset($items['qty']) OR ! isset($items['rowid']) OR ! isset($this->_cart_contents [$items['rowid']]))
{
return FALSE;
}
// Prep the quantity
$items['qty'] = preg_replace('/([^0-9])/i', '', $items['qty']);
// Is the quantity a number?
if ( ! is_numeric($items['qty']))
{
return FALSE;
}
// Is the new quantity different than what is already saved in the cart?
// If it's the same there's nothing to do
if ($this->_cart_contents [$items['rowid']]['qty'] == $items['qty'])
{
return FALSE;
}
// Is the quantity zero? If so we will remove the item from the cart.
// If the quantity is greater than zero we are updating
if ($items['qty'] == 0)
{
unset($this->_cart_contents [$items['rowid']]);
}
else
{
$this->_cart_contents [$items['rowid']]['qty'] = $items['qty'];
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Save the cart array to the session DB
*
* @access private
* @return bool
*/
function _save_cart ()
{
// Unset these so our total can be calculated correctly below
unset($this->_cart_contents ['total_items']);
unset($this->_cart_contents ['cart_total']);
// Lets add up the individual prices and set the cart sub-total
$total = 0;
foreach ($this->_cart_contents as $key => $val)
{
// We make sure the array contains the proper indexes
if ( ! is_array($val) OR ! isset($val['price']) OR ! isset($val['qty']))
{
continue;
}
$total += ($val['price'] * $val['qty']);
// Set the subtotal
$this->_cart_contents [$key]['subtotal'] = ($this->_cart_contents [$key]['price'] * $this->_cart_contents [$key]['qty']);
}
// Set the cart total and total items.
$this->_cart_contents ['total_items'] = count($this->_cart_contents );
$this->_cart_contents ['cart_total'] = $total;
// Is our cart empty? If so we delete it from the session
if (count($this->_cart_contents ) <= 2)
{
$this->CI->session->unset_userdata('cart_contents');
// Nothing more to do... coffee time!
return FALSE;
}
// If we made it this far it means that our cart has data.
// Let's pass it to the Session class so it can be stored
$this->CI->session->set_userdata(array('cart_contents' => $this->_cart_contents ));
// Woot!
return TRUE;
}
// --------------------------------------------------------------------
/**
* Cart Total
*
* @access public
* @return integer
*/
function total ()
{
return $this->_cart_contents ['cart_total'];
}
// --------------------------------------------------------------------
/**
* Total Items
*
* Returns the total item count
*
* @access public
* @return integer
*/
function total_items ()
{
return $this->_cart_contents ['total_items'];
}
// --------------------------------------------------------------------
/**
* Cart Contents
*
* Returns the entire cart array
*
* @access public
* @return array
*/
function contents ()
{
$cart = $this->_cart_contents ;
// Remove these so they don't create a problem when showing the cart table
unset($cart['total_items']);
unset($cart['cart_total']);
return $cart;
}
// --------------------------------------------------------------------
/**
* Has options
*
* Returns TRUE if the rowid passed to this function correlates to an item
* that has options associated with it.
*
* @access public
* @return array
*/
function has_options ($rowid = '')
{
if ( ! isset($this->_cart_contents [$rowid]['options']) OR count($this->_cart_contents [$rowid]['options']) === 0)
{
return FALSE;
}
return TRUE;
}
// --------------------------------------------------------------------
/**
* Product options
*
* Returns the an array of options, for a particular product row ID
*
* @access public
* @return array
*/
function product_options ($rowid = '')
{
if ( ! isset($this->_cart_contents [$rowid]['options']))
{
return array();
}
return $this->_cart_contents [$rowid]['options'];
}
// --------------------------------------------------------------------
/**
* Format Number
*
* Returns the supplied number with commas and a decimal point.
*
* @access public
* @return integer
*/
function format_number ($n = '')
{
if ($n == '')
{
return '';
}
// Remove anything that isn't a number or decimal point.
$n = trim(preg_replace('/([^0-9\.])/i', '', $n));
return number_format($n, 2, '.', ',');
}
// --------------------------------------------------------------------
/**
* Destroy the cart
*
* Empties the cart and kills the session
*
* @access public
* @return null
*/
function destroy ()
{
unset($this->_cart_contents );
$this->_cart_contents ['cart_total'] = 0;
$this->_cart_contents ['total_items'] = 0;
$this->CI->session->unset_userdata('cart_contents');
}
}
// END Cart Class
/* End of file Cart.php */
/* Location: ./system/libraries/Cart.php */ |
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发表于 2009-3-22 02:05:55
