PHP - How can I insert multiple items from a shopping cart into the database?

Question

I'd like to apologize in advance if this question has been asked before. I've been surfing this website for a couple of hours trying to find the answer I'm looking for but no luck.

Here's my problem:

I've created this online shopping cart based on a tutorial from a book by Larry Ullman (PHP and MySQL for Dynamic Websites Edition 1). Everything worked well until i realized that the writer stopped at the checkout.php

I need help coding the checkout page. My biggest problem is inserting multiple products from the shopping cart into the database as individual rows. Can anyone help?

Thanks.

Here's what i have so far:

<?php 


session_start();

if (is_numeric ($_GET['pid'])) { 

$pid = $_GET['pid'];
if (isset ($_SESSION['cart'][$pid])) {
    $qty = $_SESSION['cart'][$pid] + 1;
} else {
    $qty = 1;
}

  $_SESSION['cart'][$pid] = $qty;

echo '<p>The item has been added to your shopping cart.</p>';
} 

if (isset ($_POST['submit'])) {
foreach ($_POST['qty'] as $key => $value) {
    if ( ($value == 0) AND (is_numeric ($value)) ) {
        unset ($_SESSION['cart'][$key]);
    } elseif ( is_numeric ($value) AND ($value > 0) ) {
        $_SESSION['cart'][$key] = $value;
    }
}

}

$empty = TRUE;
if (isset ($_SESSION['cart'])) {
foreach ($_SESSION['cart'] as $key => $value) {
    if (isset($value)) {
        $empty = FALSE; 
    }
} 
}   

if (!$empty) {

include("config.php");

$query = 'SELECT * FROM buds_customer, buds_product WHERE buds_customer.customer_id = buds_product.customer_id AND buds_product.print_id IN (';
foreach ($_SESSION['cart'] as $key => $value) {
    $query .= $key . ',';
}
$query = substr ($query, 0, -1) . ') ORDER BY buds_customer.last ASC';
$result = mysql_query ($query);

echo '<table border="0" width="90%" cellspacing="3" cellpadding="3" align="center">
<tr>
    <td align="left" width="30%"><b>Seller</b></td>
    <td align="left" width="30%"><b>Product</b></td>
    <td align="right" width="10%"><b>Price</b></td>
    <td align="center" width="10%"><b>Qty</b></td>
    <td align="right" width="10%"><b>Total Price</b></td>
</tr>
<form action="view_cart.php" method="post">
';

$total = 0; // Total cost of the order.
while ($row = mysql_fetch_array ($result, MYSQL_ASSOC)) {

    $subtotal = $_SESSION['cart'][$row['print_id']] * $row['price'];
    $total += $subtotal;

    echo "  <tr>
    <td align=\"left\"><input type=\"text\" name=\"seller\" value=\"    {$row['first']}  {$row['last']}\"></td>
    <td align=\"left\"><input type=\"text\" name=\"product\" value=\"  {$row['product']}\"></td>
    <td align=\"right\"><input type=\"text\" name=\"price\" value=\"  {$row['price']}\"></td>
    <td align=\"center\"><input type=\"text\" size=\"3\"   name=\"qty[{$row['print_id']}]\" value=\"{$_SESSION['cart'][$row['print_id']]}\" /></td>
    <td align=\"right\"><input type=\"text\" name=\"subtotal\" value=\"" .     number_format ($subtotal, 2) . "\"></td>
</tr>\n";


} 

echo '  <tr>
    <td colspan="4" align="right"><b>Total:<b></td>
    <td align="right"><input type="text" size="3" name="total" value="' .    number_format ($total, 2) . '"></td>
</tr>
</table><div align="center"><input type="submit" name="submit" value="Update My  Cart" /></form><br /><br /><center><a href="checkout.php">Checkout</a></center></div>
';

} else {

echo mysql_error();
}


?>

Answer 1

Your example doesn't show any insert statements at all... You should lookup and learn INSERT INTO ( http://www.w3schools.com/php/php_mysql_insert.asp ). Then you will end up have a foreach loop... the basic code will end up looking something like this:

foreach ($items as $item) {
    $sql = 'INSERT INTO `order_history` (`productid`, `productqty`)'
        . ' VALUES ($item['product_id'], $item['product_qty']);
    mysql_query($sql);
}

Of course I'm leaving out error checking and all kinds of extra fields you will want to populate... but you get the idea. Good luck!