550 lines
15 KiB
PHP
550 lines
15 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP 4.3.2 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2006 - 2010, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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* @link http://codeigniter.com
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* @since Version 1.0
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* @filesource
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*/
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// ------------------------------------------------------------------------
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/**
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* Shopping Cart Class
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*
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* @package CodeIgniter
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* @subpackage Libraries
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* @category Shopping Cart
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* @author ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/libraries/cart.html
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*/
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class CI_Cart {
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// These are the regular expression rules that we use to validate the product ID and product name
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var $product_id_rules = '\.a-z0-9_-'; // alpha-numeric, dashes, underscores, or periods
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var $product_name_rules = '\.\:\-_ a-z0-9'; // alpha-numeric, dashes, underscores, colons or periods
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// Private variables. Do not change!
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var $CI;
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var $_cart_contents = array();
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/**
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* Shopping Class Constructor
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*
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* The constructor loads the Session class, used to store the shopping cart contents.
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*/
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function CI_Cart($params = array())
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{
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// Set the super object to a local variable for use later
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$this->CI =& get_instance();
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// Are any config settings being passed manually? If so, set them
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$config = array();
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if (count($params) > 0)
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{
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foreach ($params as $key => $val)
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{
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$config[$key] = $val;
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}
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}
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// Load the Sessions class
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$this->CI->load->library('session', $config);
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// Grab the shopping cart array from the session table, if it exists
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if ($this->CI->session->userdata('cart_contents') !== FALSE)
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{
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$this->_cart_contents = $this->CI->session->userdata('cart_contents');
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}
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else
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{
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// No cart exists so we'll set some base values
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$this->_cart_contents['cart_total'] = 0;
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$this->_cart_contents['total_items'] = 0;
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}
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log_message('debug', "Cart Class Initialized");
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}
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// --------------------------------------------------------------------
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/**
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* Insert items into the cart and save it to the session table
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*
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* @access public
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* @param array
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* @return bool
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*/
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function insert($items = array())
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{
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// Was any cart data passed? No? Bah...
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if ( ! is_array($items) OR count($items) == 0)
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{
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log_message('error', 'The insert method must be passed an array containing data.');
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return FALSE;
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}
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// You can either insert a single product using a one-dimensional array,
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// or multiple products using a multi-dimensional one. The way we
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// determine the array type is by looking for a required array key named "id"
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// at the top level. If it's not found, we will assume it's a multi-dimensional array.
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$save_cart = FALSE;
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if (isset($items['id']))
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{
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if ($this->_insert($items) == TRUE)
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{
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$save_cart = TRUE;
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}
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}
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else
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{
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foreach ($items as $val)
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{
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if (is_array($val) AND isset($val['id']))
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{
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if ($this->_insert($val) == TRUE)
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{
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$save_cart = TRUE;
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}
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}
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}
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}
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// Save the cart data if the insert was successful
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if ($save_cart == TRUE)
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{
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$this->_save_cart();
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Insert
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*
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* @access private
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* @param array
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* @return bool
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*/
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function _insert($items = array())
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{
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// Was any cart data passed? No? Bah...
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if ( ! is_array($items) OR count($items) == 0)
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{
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log_message('error', 'The insert method must be passed an array containing data.');
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return FALSE;
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}
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// --------------------------------------------------------------------
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// Does the $items array contain an id, quantity, price, and name? These are required
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if ( ! isset($items['id']) OR ! isset($items['qty']) OR ! isset($items['price']) OR ! isset($items['name']))
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{
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log_message('error', 'The cart array must contain a product ID, quantity, price, and name.');
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return FALSE;
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}
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// --------------------------------------------------------------------
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// Prep the quantity. It can only be a number. Duh...
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$items['qty'] = trim(preg_replace('/([^0-9])/i', '', $items['qty']));
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// Trim any leading zeros
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$items['qty'] = trim(preg_replace('/(^[0]+)/i', '', $items['qty']));
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// If the quantity is zero or blank there's nothing for us to do
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if ( ! is_numeric($items['qty']) OR $items['qty'] == 0)
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{
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return FALSE;
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}
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// --------------------------------------------------------------------
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// Validate the product ID. It can only be alpha-numeric, dashes, underscores or periods
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// Not totally sure we should impose this rule, but it seems prudent to standardize IDs.
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// Note: These can be user-specified by setting the $this->product_id_rules variable.
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if ( ! preg_match("/^[".$this->product_id_rules."]+$/i", $items['id']))
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{
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log_message('error', 'Invalid product ID. The product ID can only contain alpha-numeric characters, dashes, and underscores');
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return FALSE;
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}
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// --------------------------------------------------------------------
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// Validate the product name. It can only be alpha-numeric, dashes, underscores, colons or periods.
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// Note: These can be user-specified by setting the $this->product_name_rules variable.
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if ( ! preg_match("/^[".$this->product_name_rules."]+$/i", $items['name']))
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{
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log_message('error', 'An invalid name was submitted as the product name: '.$items['name'].' The name can only contain alpha-numeric characters, dashes, underscores, colons, and spaces');
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return FALSE;
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}
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// --------------------------------------------------------------------
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// Prep the price. Remove anything that isn't a number or decimal point.
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$items['price'] = trim(preg_replace('/([^0-9\.])/i', '', $items['price']));
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// Trim any leading zeros
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$items['price'] = trim(preg_replace('/(^[0]+)/i', '', $items['price']));
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// Is the price a valid number?
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if ( ! is_numeric($items['price']))
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{
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log_message('error', 'An invalid price was submitted for product ID: '.$items['id']);
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return FALSE;
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}
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// --------------------------------------------------------------------
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// We now need to create a unique identifier for the item being inserted into the cart.
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// Every time something is added to the cart it is stored in the master cart array.
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// Each row in the cart array, however, must have a unique index that identifies not only
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// a particular product, but makes it possible to store identical products with different options.
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// For example, what if someone buys two identical t-shirts (same product ID), but in
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// different sizes? The product ID (and other attributes, like the name) will be identical for
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// both sizes because it's the same shirt. The only difference will be the size.
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// Internally, we need to treat identical submissions, but with different options, as a unique product.
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// Our solution is to convert the options array to a string and MD5 it along with the product ID.
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// This becomes the unique "row ID"
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if (isset($items['options']) AND count($items['options']) > 0)
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{
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$rowid = md5($items['id'].implode('', $items['options']));
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}
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else
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{
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// No options were submitted so we simply MD5 the product ID.
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// Technically, we don't need to MD5 the ID in this case, but it makes
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// sense to standardize the format of array indexes for both conditions
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$rowid = md5($items['id']);
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}
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// --------------------------------------------------------------------
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// Now that we have our unique "row ID", we'll add our cart items to the master array
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// let's unset this first, just to make sure our index contains only the data from this submission
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unset($this->_cart_contents[$rowid]);
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// Create a new index with our new row ID
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$this->_cart_contents[$rowid]['rowid'] = $rowid;
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// And add the new items to the cart array
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foreach ($items as $key => $val)
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{
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$this->_cart_contents[$rowid][$key] = $val;
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}
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// Woot!
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Update the cart
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*
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* This function permits the quantity of a given item to be changed.
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* Typically it is called from the "view cart" page if a user makes
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* changes to the quantity before checkout. That array must contain the
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* product ID and quantity for each item.
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*
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* @access public
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* @param array
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* @param string
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* @return bool
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*/
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function update($items = array())
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{
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// Was any cart data passed?
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if ( ! is_array($items) OR count($items) == 0)
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{
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return FALSE;
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}
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// You can either update a single product using a one-dimensional array,
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// or multiple products using a multi-dimensional one. The way we
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// determine the array type is by looking for a required array key named "id".
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// If it's not found we assume it's a multi-dimensional array
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$save_cart = FALSE;
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if (isset($items['rowid']) AND isset($items['qty']))
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{
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if ($this->_update($items) == TRUE)
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{
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$save_cart = TRUE;
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}
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}
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else
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{
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foreach ($items as $val)
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{
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if (is_array($val) AND isset($val['rowid']) AND isset($val['qty']))
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{
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if ($this->_update($val) == TRUE)
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{
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$save_cart = TRUE;
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}
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}
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}
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}
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// Save the cart data if the insert was successful
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if ($save_cart == TRUE)
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{
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$this->_save_cart();
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Update the cart
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*
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* This function permits the quantity of a given item to be changed.
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* Typically it is called from the "view cart" page if a user makes
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* changes to the quantity before checkout. That array must contain the
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* product ID and quantity for each item.
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*
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* @access private
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* @param array
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* @return bool
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*/
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function _update($items = array())
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{
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// Without these array indexes there is nothing we can do
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if ( ! isset($items['qty']) OR ! isset($items['rowid']) OR ! isset($this->_cart_contents[$items['rowid']]))
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{
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return FALSE;
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}
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// Prep the quantity
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$items['qty'] = preg_replace('/([^0-9])/i', '', $items['qty']);
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// Is the quantity a number?
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if ( ! is_numeric($items['qty']))
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{
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return FALSE;
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}
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// Is the new quantity different than what is already saved in the cart?
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// If it's the same there's nothing to do
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if ($this->_cart_contents[$items['rowid']]['qty'] == $items['qty'])
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{
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return FALSE;
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}
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// Is the quantity zero? If so we will remove the item from the cart.
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// If the quantity is greater than zero we are updating
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if ($items['qty'] == 0)
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{
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unset($this->_cart_contents[$items['rowid']]);
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}
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else
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{
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$this->_cart_contents[$items['rowid']]['qty'] = $items['qty'];
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Save the cart array to the session DB
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*
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* @access private
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* @return bool
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*/
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function _save_cart()
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{
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// Unset these so our total can be calculated correctly below
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unset($this->_cart_contents['total_items']);
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unset($this->_cart_contents['cart_total']);
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// Lets add up the individual prices and set the cart sub-total
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$total = 0;
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foreach ($this->_cart_contents as $key => $val)
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{
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// We make sure the array contains the proper indexes
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if ( ! is_array($val) OR ! isset($val['price']) OR ! isset($val['qty']))
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{
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continue;
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}
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$total += ($val['price'] * $val['qty']);
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// Set the subtotal
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$this->_cart_contents[$key]['subtotal'] = ($this->_cart_contents[$key]['price'] * $this->_cart_contents[$key]['qty']);
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}
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// Set the cart total and total items.
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$this->_cart_contents['total_items'] = count($this->_cart_contents);
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$this->_cart_contents['cart_total'] = $total;
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// Is our cart empty? If so we delete it from the session
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if (count($this->_cart_contents) <= 2)
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{
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$this->CI->session->unset_userdata('cart_contents');
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// Nothing more to do... coffee time!
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return FALSE;
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}
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// If we made it this far it means that our cart has data.
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// Let's pass it to the Session class so it can be stored
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$this->CI->session->set_userdata(array('cart_contents' => $this->_cart_contents));
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// Woot!
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Cart Total
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*
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* @access public
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* @return integer
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*/
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function total()
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{
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return $this->_cart_contents['cart_total'];
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}
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// --------------------------------------------------------------------
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/**
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* Total Items
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*
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* Returns the total item count
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*
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* @access public
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* @return integer
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*/
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function total_items()
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{
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return $this->_cart_contents['total_items'];
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}
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// --------------------------------------------------------------------
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/**
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* Cart Contents
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*
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* Returns the entire cart array
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*
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* @access public
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* @return array
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*/
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function contents()
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{
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$cart = $this->_cart_contents;
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// Remove these so they don't create a problem when showing the cart table
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unset($cart['total_items']);
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unset($cart['cart_total']);
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return $cart;
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}
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// --------------------------------------------------------------------
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/**
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* Has options
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*
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* Returns TRUE if the rowid passed to this function correlates to an item
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* that has options associated with it.
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*
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* @access public
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* @return array
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*/
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function has_options($rowid = '')
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{
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if ( ! isset($this->_cart_contents[$rowid]['options']) OR count($this->_cart_contents[$rowid]['options']) === 0)
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{
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return FALSE;
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Product options
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*
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* Returns the an array of options, for a particular product row ID
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*
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* @access public
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* @return array
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*/
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function product_options($rowid = '')
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{
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if ( ! isset($this->_cart_contents[$rowid]['options']))
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{
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return array();
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}
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return $this->_cart_contents[$rowid]['options'];
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}
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// --------------------------------------------------------------------
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/**
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* Format Number
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*
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* Returns the supplied number with commas and a decimal point.
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*
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* @access public
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* @return integer
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*/
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function format_number($n = '')
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{
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if ($n == '')
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{
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return '';
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}
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// Remove anything that isn't a number or decimal point.
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$n = trim(preg_replace('/([^0-9\.])/i', '', $n));
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return number_format($n, 2, '.', ',');
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}
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// --------------------------------------------------------------------
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/**
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* Destroy the cart
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*
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* Empties the cart and kills the session
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*
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* @access public
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* @return null
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*/
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function destroy()
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{
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unset($this->_cart_contents);
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$this->_cart_contents['cart_total'] = 0;
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$this->_cart_contents['total_items'] = 0;
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$this->CI->session->unset_userdata('cart_contents');
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}
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}
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// END Cart Class
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/* End of file Cart.php */
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/* Location: ./system/libraries/Cart.php */ |