Despite much Googling, I haven’t been able to find a ready made shopping cart for the CodeIgniter PHP framework. Unfortunately one of my current projects requires such a thing, so I decided to roll my own. Starting from the code here: http://v3.thewatchmakerproject.com/journal/276/building-a-simple-php-shopping-cart, I made a few changes to fit the CodeIgniter way of doing things.
The revised version looks like this:
<?php
// Based on http://v3.thewatchmakerproject.com/journal/276/building-a-simple-php-shopping-cart
class Cart extends Controller {
function Cart() {
parent::Controller();
$this->load->library('session');
$this->load->helper('url');
}
function index() {
$cart = $this->session->userdata('cart');
if ($cart) {
$items = explode(',', $cart);
$contents = array();
foreach ($items as $item) {
$contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
}
}
if ($contents) {
$id_list = '';
foreach (array_keys($contents) as $val)
$id_list .= $this->db->escape($val) . ',';
$id_list = substr($id_list, 0, len($id_list) - 1);
$query_string = "SELECT * FROM stock_table WHERE id IN(" . $id_list . ")";
$query = $this->db->query($query_string);
if ($query->num_rows() > 0) {
$basket = array();
foreach ($query->result() as $row) {
$basket[] = array('id' => $row->id, 'caption' => $row->caption, 'price' => $row->price,
'qty' => $contents[$row->id], 'total' => $contents[$row->id] * $row->price);
}
}
}
$data = array();
if ($basket) {
$data['basket'] = $basket;
$grand_total = 0;
foreach ($basket as $item)
$grand_total += $item[total];
$data['grand_total'] = sprintf("%01.2f", $grand_total);
}
else
$data['grand_total'] = sprintf("%01.2f", 0);
$data['page'] = 'cart_view';
$data['title'] = "Your basket";
$this->load->view('template/container', $data);
}
function add_item($item_id='') {
$cart = $this->session->userdata('cart');
if ($cart) {
$cart .= ',' . $item_id;
} else {
$cart = $item_id;
}
$this->session->set_userdata(array('cart' =>
$cart));
redirect('/cart/', 'refresh');
}
function delete_item($item_id='') {
$cart = $this->session->userdata('cart');
if ($cart) {
$items = explode(',', $cart);
$newcart = '';
foreach ($items as $item) {
if ($item_id != $item) {
if ($newcart != '') {
$newcart .= ',' . $item;
} else {
$newcart = $item;
}
}
}
$cart = $newcart;
}
$this->session->set_userdata(array('cart' =>
$cart));
redirect('/cart/', 'refresh');
}
function delete_all() {
$this->session->unset_userdata('cart');
redirect('/cart/', 'refresh');
}
function update_cart() {
if ($cart) {
$newcart = '';
foreach ($_POST as $key => $value) {
if (stristr($key, 'qty')) {
$id = str_replace('qty', '', $key);
$items = ($newcart != '') ? explode(',', $newcart) : explode(',', $cart);
$newcart = '';
foreach ($items as $item) {
if ($item_id != $item) {
if ($newcart != '') {
$newcart .= ',' . $item;
} else {
$newcart = $item;
}
}
}
for ($i = 1; $i <= $value; $i++) {
if ($newcart != '') {
$newcart .= ',' . $id;
} else {
$newcart = $id;
}
}
}
}
}
$this->session->set_userdata(array('cart' =>
$newcart));
redirect('/cart/', 'refresh');
}
function checkout() {
}
}
The associated view looks like this:
Basket Total: £<?= $grand_total ?>
<?php
if (isset($basket)) {
?>
Empty Cart
Checkout
<?php
} else {
?>
Your shopping basket is empty.
<?php
}
?>
The code also assumes a database “stock_table” with the following structure:
--
-- Table structure for table `stock_table`
--
CREATE TABLE IF NOT EXISTS `stock_table` (
`id` int(10) unsigned NOT NULL auto_increment,
`caption` varchar(20) NOT NULL,
`quantity` int(10) NOT NULL default '0',
`price` float NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
This code has yet to be put to the test in a production environment, so use it entirely at your own risk. You will also notice that the checkout function has not been completed. This is a project for another day, and it’s worth looking at the CodeIgniter PayPal library http://codeigniter.com/wiki/PayPal_Lib/ to help you.
{lang: 'en-GB'}
Despite much Googling, I haven't been able to find a ready made shopping cart for the CodeIgniter PHP framework. Unfortunately one of my current projects requires such a thing, so I decided to roll my own. Starting from the code here: http://v3.thewatchmakerproject.com/journal/276/building-a-simple-php-shopping-cart, I made a few changes to fit the CodeIgniter way of doing ...
Technology | admin | 
January 27, 2010 7:01 pm | 
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