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Cart Library Update
Cart Library Version 1.0
I notice that insert() delete`s the previous Identical item and insert a new one so I decided to do little changes here it is:
<?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
- @Updated by Jhayghost (http://www.websmarttechno.com) [email protected]
- @copyright Copyright (c) 2006 - 2010, 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
if(isset($this->_cart_contents[$rowid]["rowid"]) && $this->_cart_contents[$rowid]["rowid"] == $rowid) { $items["rowid"] = $rowid; $items["qty"] = $this->_cart_contents[$rowid]['qty'] + $items['qty']; if ($this->_update($items) == TRUE) { return TRUE; } }else { unset($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 */