Create a receipt using PHP POST array data

Question

I am learning PHP and trying to make a simple cart/processing script.

I have created the item cart fine, but I am having trouble displaying information in my receipt when a user commits to buying the item(s) in their cart.

To save space/time I have omitted my item lists and the generation of the cart, they can be found here if you need it.

Here is the PHP that posts the data to my checkout.php script cart.php (Updated to reflect change)

<?php 
session_start(); ?>
<form name="cart" id="cart" action="checkout.php" target='_blank'
    method='post'>
    <h1>Your Cart:</h1>
    <table>
        <tr>
            <td><span class='title'>ID</span></td>
            <td><span class='title'>Product</span></td>
            <td><span class='title'>Price</span></td>
        </tr>
        <?php
// Set a default total
$total = 0;
foreach ( $_SESSION['cart'] as $cartid ) {
    ?>
        <tr>
            <td width="20%">
                <?php echo $cartid; ?> <input type="hidden" name="id[]"
                value="<?php echo $cartid; ?>">
            </td>
            <td width="100%">
                <?php echo $title?>
                <input type="hidden" name="title[]" value="<?php echo $title; ?>">
            </td>
            <td width="100%">$<?php echo $price;?>
                <input type="hidden" name="prices[]" value="<?php echo $price; ?>">
            </td>
        </tr>
        <?php
    $total += $price;
} // end foreach
?>
        <tr>
            <td>Total</td>
            <td></td>
            <td>$<?php echo $total; ?></td>
        </tr>
    </table>
    <input type="submit" value="Buy" class="submit-button" />
</form>

checkout.php (Updated to reflect change)

<table>
    <tr>
        <th>ID</th>
        <th>Product</th>
        <th>Price</th>
    </tr>
    <?php
foreach($_POST['ids'] as $id) {
  echo "  
  <tr>
    <td>$id</td>
    <td>$_POST['titles'][$id]</td>
    <td>$_POST['prices'][$id]</td>
  </tr>
  ";
}

?>
    <tr>
        <td>Total</td>
        <td></td>
        <td>$</td>
    </tr>
</table>

I cannot seem to get the foreach loop to read the item id, title, or price. I can see the array is being passed using print_r($_POST); but it is indexing each item as a new array item e.g:

Array
(
[checkout] => Array
    (
        [0] => A123
        [1] => Item1
        [2] => 1000 
        [3] => Z999
        [4] => Item999
        [5] => 9999  
    )
)

How can I post the information in a more meaningful way i.e. associated array. Then use that associated array to display information in a table like format?

Expected output

<table>
  <tr>
    <th>ID</th>
    <th>Product</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>A123</td>
    <td>Item1</td>
    <td>$1000</td>
  </tr>
  <tr>
    <td>Z999</td>
    <td>Item999</td>
    <td>$9999</td>
  </tr>
  <tr>
    <td>Total</td>
    <td></td>
    <td>$10999</td>
  </tr>
</table>

N.B: This is just a learning exercise so array sanitizing not required, and no SQL.

Edit: Updated to reflect @Obsidian Age recommendations, getting parse error now

you would have to get the price and title from somewhere based on the ID... — Leo Wilson, Feb 09 '17 at 01:46

Obsidian Age · Accepted Answer · 2017-02-09T03:32:08.280

2

Your items all have the same name attribute in HTML:

<input type="hidden" name="checkout[]">

You would need three different named variables for submission, with one of them being the ID of the particular transaction:

<input type="hidden" name="ids[]">
<input type="hidden" name="titles[]">
<input type="hidden" name="prices[]">

Then you can loop through each item and add it to a corresponding array:

$titles = [];
$prices = [];
foreach($_POST['ids'] as $id) {
  array_push($titles, $_POST['titles'][$id]);
  array_push($prices, $_POST['prices'][$id]);
}

Or output it directly:

foreach($_POST['ids'] as $id) {
  $title = $_POST['titles'][$id];
  $price = $_POST['prices'][$id];
  echo "  
  <tr>
    <td>$id</td>
    <td>$title<td>
    <td>$price</td>
  </tr>
  ";
}

Hope this helps! :)

edited Feb 09 '17 at 03:32

answered Feb 09 '17 at 02:34

Obsidian Age

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Thanks for the quick feed-back @Obsidian Age ! I changed the cart.php file to have unique names, and the checkout.php to your direct output. I am getting a parse error though? Parse error: syntax error, unexpected '' (T_ENCAPSED_AND_WHITESPACE), expecting identifier (T_STRING) or variable (T_VARIABLE) or number (T_NUM_STRING) – Ben Feb 09 '17 at 03:10
1

Hmm, apparently you can't use single quotes for an array when echoing directly. `echo "['a']"` is valid, and `echo "$a[b]"` is valid, but apparently `echo "$a['b']"` is a syntax error. I'll update my answer now to assign them to a variable first. – Obsidian Age Feb 09 '17 at 03:29
1

Fixed -- the new direct output method should work -- my apologies :) – Obsidian Age Feb 09 '17 at 03:32
No problems at all, thanks so much for the edit @Obsidian Age I also messed up my syntax it turns out i was posting name="id[]" and looking for ids[] "foreach($_POST['ids'] as $id)". Doh! – Ben Feb 09 '17 at 03:36

Create a receipt using PHP POST array data

1 Answers1