Committed Cart Class
diff --git a/system/libraries/Cart.php b/system/libraries/Cart.php
new file mode 100644
index 0000000..a0b782b
--- /dev/null
+++ b/system/libraries/Cart.php
@@ -0,0 +1,528 @@
+<?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()
+ {
+ // First we add up the individual prices and get the cart total
+ $total = 0;
+ foreach ($this->_cart_contents as $key => $val)
+ {
+ // We make sure the array contains the proper indexes
+ if ( ! isset($val['price']) or ! isset($val['qty']))
+ {
+ continue;
+ }
+
+ $total += ($val['price'] * $val['qty']);
+
+ // Set the subtotal
+ // Note: "subtotal" is a reserved array index. We need to make a note of that in the docs
+ $this->_cart_contents[$key]['subtotal'] = number_format(($this->_cart_contents[$key]['price'] * $this->_cart_contents[$key]['qty']), 2);
+ }
+
+ // Unset these so our total can be calculated correctly below
+ unset($this->_cart_contents['total_items']);
+ unset($this->_cart_contents['cart_total']);
+
+ // 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' => $this->_cart_contents));
+
+ // Woot!
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Cart Total
+ *
+ * @access public
+ * @return integer
+ */
+ function total()
+ {
+ return number_format($this->_cart_contents['cart_total'], 2);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * 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'];
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * 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->sess_destroy();
+ }
+
+
+}
+// END Cart Class
+
+/* End of file Cart.php */
+/* Location: ./system/libraries/Cart.php */
\ No newline at end of file