This application is included in the default Influx distribution, to run it, access http://your_site/influx/index.php?/products

1. Requirements

• PHP4 (not tested with version 5, although it should work)

2. Design your application

It's really important to define the controllers involved in the process before starting to code.

In this simple example, we'll have a simple shop with no user login, so we'll have

• ProductsController, which will list the products available
• CartController, which we'll use to add products to the cart and checkout

3. Code

The Controllers

/app/products.php the ProductsController

<?php
class ProductsController extends Controller {

	/**
	 * Lists all the products in the store
	 *
	 */
	function index() {
		
		// this might have come from a database, you know
		$products = array('Corn', 'Rice', 'Beans', 'Milk', 'Meat', 'Tea', 'Coffee', 'Cake', 'Soda', 'Pie', 'Matches', 'Beer');
		
		$this->set('products', $products);
	}
}
?>

/app/cart.php, The CartController

<?php
class CartController extends Controller {

	/**
	 * Lists the products in the shopping cart
	 *
	 */	
	function index() {
		
		// Load the "Cart" session variable
		$cart_contents = session('cart');
		
		// Export that to the view (/app/views/cart/index.php)
		$this->set('cart_contents', $cart_contents);
	}

	/**
	 * Displays the checkout form
	 *
	 */	
	function checkout() {

	}
	
	/**
	 * Adds a product to the cart
	 * Please note that this function has no view. 
	 * It just adds the product to the session and redirects back to the Products list
	 */ 
	function add($product) {
		// load the cart
		$cart = session('cart');
		
		// append the new product to it
		$cart[] = $product;
		
		// save again
		session('cart', $cart);
		
		// back to the products
		redirect('/products');
		
	}

	/**
	 * Displays a message confirming the checkout
	 *
	 */
	function confirm() {
		// If no email was set, redirect to the cart contents
		if(!isset($this->data['form']['email'])) {
			redirect('/cart');
		}
		
		// on a real app we'd at least send an email to the user
		
		// clean up the cart
		session('cart', array());
	}
}
?>

The Views

/app/views/products/index.php - Lists all products

<table width="100%" border="1">
<?php
foreach($products as $product):
?>
<tr><td><?=$product ?></td><td><a href="<?=url("/cart/add/$product") ?>">Add to Cart</a></td></tr>
<?php
endforeach;
?>
</table>
<p><a href="<?=url("/cart") ?>">Show cart contents</a></p>

/app/views/cart/index.php - Lists the cart's content

<h1>Your cart has</h1>
<?php if(count($cart_contents) == 0): ?>
<p>No Items | <a href="<?=url('/products') ?>">Continue Shopping</a></p>
<?php 
else: 
foreach($cart_contents as $product) {
	echo "<p>$product</p>";
}
?>
<p><a href="<?=url('/cart/checkout') ?>">Proceed to checkout</a> | <a href="<?=url('/products') ?>">Continue Shopping</a></p>
<?php
endif;
?>

/app/views/cart/checkout.php - Asks for the user's email address and POSTs it to checkout

<form action="<?=url('/cart/confirm') ?>" method="post">
<p>Please type in your email address: <input type="text" name="email"/></p>
<p><input type="submit" value="Confirm checkout"></p>
</form>

/app/views/cart/confirm.php - Confirms that the checkout went ok

<h1>Thank you for shopping at the influx webstore!</h1>

<?php
// The $form variable is always automatically set. 
// It contains the variables the app received via POST
?>
<p>Payment details were sent to <?=$form['email'] ?></p>

<p><a href="<?=url('/products') ?>">Shop Again!</a></p>