Simple PHP Shopping Cart

[htorbov]

Hi!

 

I use the following PHP Session Shopping Cart (it's ready to use)

<?
session_start();

function showCart() {
    $cart = $_SESSION['cart'];
    if ($cart) {
        $items = explode(',',$cart);
        $contents = array();
        foreach ($items as $item) {
            $contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
        }
        foreach ($contents as $id=>$qty) {
            $output[] = 'You have '.$qty.' items with ID: '.$id;
        }
    }
    else {
        $output[] = 'You don\'t have items in your cart';
    }
    return join('',$output);
}

if(isset($_SESSION['cart'])) {
    $cart = $_SESSION['cart'];
}
else {
    $cart = 0;
}

if(isset($_GET['action'])) {
    $action = $_GET['action'];
    switch ($action) {
        case 'add':
            if ($cart) {
                $cart .= ','.$_GET['id'];
            } else {
                $cart = $_GET['id'];
            }
            break;
        case 'delete':
            if ($cart) {
                $items = explode(',',$cart);
                $newcart = '';
                foreach ($items as $item) {
                    if ($_GET['id'] != $item) {
                        if ($newcart != '') {
                            $newcart .= ','.$item;
                        } else {
                            $newcart = $item;
                        }
                    }
                }
                $cart = $newcart;
            }
            break;
        case 'update':
        if ($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 $item) {
                        if ($id != $item) {
                            if ($newcart != '') {
                                $newcart .= ','.$item;
                            } else {
                                $newcart = $item;
                            }
                        }
                    }
                    for ($i=1;$i<=$value;$i++) {
                        if ($newcart != '') {
                            $newcart .= ','.$id;
                        } else {
                            $newcart = $id;
                        }
                    }
                }
            }
        }
        $cart = $newcart;
        break;
    }
}

$_SESSION['cart'] = $cart;

echo showCart();
echo '<br/>';
echo '<a href="?action=add&id=1">Add to Cart</a>';
?>

 

Example of usage:

===

<a href="cart.php?action=add&id=1">Add to Cart</a> // Adding a new product in the cart with ID 1

<a href="cart.php?action=delete&id=1">Delete from Cart</a> // Deleting a new product in the cart with ID 1

<a href="cart.php?action=update&id=1&qty=5">Update Quantity to 5</a> // Updating the quantity of product with ID 1

===

 

Everything is fine, but now I want to add sizes, something like: cart.php?action=add&id=1&size=XXXL.

 

For example, the case "add" can be done like that:

$cart = $_GET['id'].":".$_GET['size'];

..  and then the products will be saved like 1:XXXL, but then the updating and deleting will not work ..

 

Please help me, I'm very confused how this can be done

[htorbov]

I'm starting to think that this is not possible  :'(

I tried to save the contents like: 1:XXXL, 2:S, 3:M for example but then I can't split it with explode() correctly..

[scootstah]

I would store the contents of the cart in an array instead of a string. You can work on it a lot easier and you don't have to use explode a bunch of times. When you add something it might look like,

$id = $_GET['id'];
$size = $_GET['size'];
$qty = $_GET['qty'];

$cart[$id] = array('size' => $size, 'qty' => $qty);

 

This way, you can add as much additional information about the item as you want with very little effort.

[htorbov]

Thanks!

 

Now when I type print_r($cart) I get:

Array ( [1] => Array ( => XXXL [qty] => 5 ) )

 

Now how can I use the foreach function to see the contents as: ID: 1, Size: XXXL, Quantity: 5 (for example)?

 

[htorbov]

Nevermind, I did it. So now the question is: what is the best way to save it in the database?

[scootstah]

You should try to split up the tables and normalize as best you can. For example, you might have a products table holding all of the product names. Then have a cart table, holding a user id, product id, and some options like size, color, quantity etc.