PHP: shopping cart empty after clicking the add button

mariade · January 7, 2018, 10:44am

As per title, I have a problem when adding products to the cart: it would show a window message that says that the product has been added, but in truth it is not there. It gives the following error: Fatal error: Cannot use object of type stdClass as array .

La linea di codice e’:

<?php echo $value['item_name']; ?>

Here is the code file reserve.php :

[php]

<?php session_start(); ini_set('display_errors', 1); $connect = mysqli_connect('127.0.0.1', 'root', '***********', 'Community Garden List'); if (isset($_POST['add'])) { if (isset($_SESSION['cart'])) { $item_array_id = array_column($_SESSION['cart'], 'product_id'); if (!in_array($_GET['id'], $item_array_id)) { $count = count($_SESSION['cart']); $item_array = array( 'product_id' => $_GET['id'], 'item_name' => $_POST['hidden_name'], 'product_price' => $_POST['hidden_price'], 'item_quantity' => $_POST['quantity'], ); $_SESSION['cart'][$count] = $item_array; echo ''; } else { echo ''; echo ''; } } else { $item_array = array( 'product_id' => $_GET['id'], 'item_name' => $_POST['hidden_name'], 'product_price' => $_POST['hidden_price'], 'item_quantity' => $_POST['quantity'], ); $_SESSION['cart'][0] = $item_array; } } if (isset($_GET['action'])) { if ($_GET['action'] == 'delete') { foreach ($_SESSION['cart'] as $keys => $value) { if ($value['product_id'] == $_GET['id']) { unset($_SESSION['cart'][$keys]); echo ''; echo ''; } } } } ?>

?>[/php]

html code

[php]<?php

$query = ‘SELECT * FROM product ORDER BY serial ASC’;
$result = mysqli_query($connect, $query);

if (mysqli_num_rows($result) > 0) {
while ($row = mysqli_fetch_array($result)) {
?>

           <img src="<?php echo $row['image']; ?>" class="img-responsive" style="width:100%;>
       <h5 class="text-info"><?php echo $row['pname']; ?></h5>
       <h5 class="text-danger">€ <?php echo $row['price']; ?></h5>
       <h5 class="text-info"><?php echo $row['pdescription']; ?></h5>
       <input type="text" name="quantity" class="form-control" value="1">
       <input type="hidden" name="hidden_name" value="<?php echo $row['pname']; ?>">
       <input type="hidden" name="hidden_price" value="<?php echo $row['price']; ?>">
       <input type="hidden" name="hidden_pdescription" value="<?php echo $row['pdescription']; ?>">
       <input type="submit" name="add" style="margin-top:5px;" class="btn btn-success" value="Add to Bag">
       </div>
       </form>
       </div>
       <?php

   }

[/php]
I’ve tried print “

”; var_dump($row); exit;

after this line: foreach e($_SESSION[‘cart’] as $key => $value) { and it comes a table with NULL inside. What does that mean?

Before that, i tried to change $value[‘item_name’] with $value->item_name , and i got the following error:
Notice: Undefined property: stdClass::$item_name in

Will you please help me to understand what’s wrong?thank you.

mariade · January 7, 2018, 11:49am

sorry, this is the last part of the code:

}
}
?>

The above brackets and closing ta are from the second part of the code. Sorry for the confusion, but I couldn’t see the edit optiob on my post.
[php]

<?php if(!empty($_SESSION["cart"])){ $total = 0; foreach ($_SESSION["cart"] as $key => $value) { ?>

                    <tr>
                        <td><?php echo $value["item_name"]; ?></td>
                        <td><?php echo $value["item_quantity"]; ?></td>
                        <td>$ <?php echo $value["product_price"]; ?></td>
                        <td>
                            $ <?php echo number_format($value["item_quantity"] * $value["product_price"], 2); ?></td>
                        <td><a href="Cart.php?action=delete&id=<?php echo $value["product_id"]; ?>"><span
                                    class="text-danger">Remove Item</span></a></td>

                    </tr>
                    <?php
                    $total = $total + ($value["item_quantity"] * $value["product_price"]);
                }
                    ?>
                    <tr>
                        <td colspan="3" align="right">Total</td>
                        <th align="right">$ <?php echo number_format($total, 2); ?></th>
                        <td></td>
                    </tr>
                    <?php
                }
            ?>
        </table>
    </div>

</div>[/php]

Antonio · January 7, 2018, 7:03pm

hi mariade,

It is a good idea to turn on display errors before session_start:
[php]<?php
ini_set(‘display_errors’, 1);
session_start();[/php]

And change this
[php][/php]
to [php][/php]

Hope it’l help

mariade · January 8, 2018, 12:19am

thanks, I tried both advice but no luck, same errors.

Antonio · January 8, 2018, 3:44am

Can you make an archive with those files and attach to this topic?

astonecipher · January 8, 2018, 7:12am

Dump the contents of what is in tje session cart. I dont think you are deep enough, yet.

Dont use hidden prices. It is a very old way to do things and an easy way to get burned very quickly.

mariade · January 8, 2018, 11:51am

Hi Antonio,
I will post the zip files.
Thanks for your help.

reserve.php.zip (3.16 KB)

mariade · January 8, 2018, 11:52am

database file

tables.zip (3.02 KB)

mariade · January 8, 2018, 11:54am

images folder file contains only two images, the other are too big to attach, sorry.

cart.zip (223 KB)

Antonio · January 8, 2018, 12:49pm

Fixed

reserve.zip (3.24 KB)

mariade · January 8, 2018, 8:00pm

thanks Antonio, this morning I sorted too, only the table was out of place. thank you very much.
was it only a brackets problem?

mariade · January 8, 2018, 11:09pm

I’ve found a bug: it won’t add more than one product to the cart, even if for the same product I would like quantity 2. If I add a different product, it will show me a window message saying that the product is already in the cart and it won’t add it.
How will i fix it?

Antonio · January 9, 2018, 6:06am

Hi,

Programming is the art of dividing and hiding So you should divide and hide. PHP-logic into one folder, HTML into another.

Here is a diagram of how to divide and realization.

This is reserve.php after dividing and hiding:
[php]<?php

chdir(DIR);

require_once ‘init.php’; // Hide common functions

$action = isset($_REQUEST[‘action’]) ? $_REQUEST[‘action’] : null;

switch ($action) {
case ‘add’:
include ‘cart/add.php’;
header(‘Location: reserve.php’);
break;

case 'delete':
    include 'cart/delete.php';
    header('Location: reserve.php');
    break;
    
// You have to write checkout.php
case 'checkout':
    include 'template/header.php';
    include 'template/checkout.php';
    include 'template/footer.php';
    break;
    
// You have to write cart/save.php and thank_you.php
case 'save_order':
    include 'cart/save.php';
    header('Location: thank_you.php');
    break;
    
default:
    include 'template/header.php';  // Split big HTML into parts: header, content and footer
    include 'template/products.php';
    include 'template/products_in_cart.php';
    include 'template/footer.php';
    break;

}[/php]

reserve-2.0.zip (230 KB)

mariade · January 9, 2018, 11:39am

I’m taking a look now, thanks for your time and clarification. I will keep you posted.

Antonio · January 9, 2018, 12:19pm

Ok, try this url or you can observe source code from the archive by this url

hope it helps