Hi all,
I am trying two days now to insert a cart link on my page. It is a e-shop bookstore.
I save my books in a database :
+-------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+---------+----------------+
| bookid | int(11) | NO | PRI | NULL | auto_increment |
| title | varchar(200) | NO | | NULL | |
| author | varchar(100) | NO | | NULL | |
| publisher | varchar(100) | NO | | NULL | |
| catid | int(11) | NO | | NULL | |
| cost | float | NO | | NULL | |
| isbn | varchar(10) | NO | | NULL | |
| description | text | NO | | NULL | |
| weight | int(5) | YES | | NULL | |
| nopages | int(4) | YES | | NULL | |
| imagename | varchar(100) | NO | | NULL | |
| sales | int(5) | NO | | NULL | |
+-------------+--------------+------+-----+---------+----------------+
And I have a detail page for book with a link "order".
When a user clicks on order then cart.php page opens.
The link order is ::
echo '<a href="cart.php?action=add&id='.$isbn.'" class="more"><img src="images/order_now.gif" alt="" title="" border="0" /></a>';While the cart.php is ::
<?php
include_once('header.php');
function writeShoppingCart()
{
$cart = $_SESSION['cart'];
if (!$cart) {
return '<p>You have no items in your shopping cart</p>';
} else {
// Parse the cart session variable
$items = explode(',',$cart);
$s = (count($items) > 1) ? 's':'';
return '<p>You have <a href="cart.php">'.count($items).' item'.$s.' in your shopping cart</a></p>';
}
}
function showCart()
{
global $db;
$cart = $_SESSION['cart'];
if ($cart) {
$items = explode(',',$cart);
$contents = array();
foreach ($items as $item) {
$contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
}
$output[] = '<form action="cart.php?action=update" method="post" id="cart">';
$output[] = '<table>';
foreach ($contents as $id=>$qty) {
$sql = "SELECT * FROM books WHERE isbn = ".$id."";
$result = query($sql);
$row = $result->fetch();
extract($row);
$output[] = '<tr>';
$output[] = '<td><a href="cart.php?action=delete&id='.$id.'" class="r">Remove</a></td>';
$output[] = '<td>'.$title.' by '.$author.'</td>';
$output[] = '<td>£'.$price.'</td>';
$output[] = '<td><input type="text" name="qty'.$id.'" value="'.$qty.'" size="3" maxlength="3" /></td>';
$output[] = '<td>£'.($price * $qty).'</td>';
$total += $price * $qty;
$output[] = '</tr>';
}
$output[] = '</table>';
$output[] = '<p>Grand total: <strong>£'.$total.'</strong></p>';
$output[] = '<div><button type="submit">Update cart</button></div>';
$output[] = '</form>';
} else {
$output[] = '<p>You shopping cart is empty.</p>';
}
return join('',$output);
}
// Start the session
session_start();
// Process actions
$cart = $_SESSION['cart'];
$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;
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>PHP Shopping Cart Demo Cart</title>
<link rel="stylesheet" href="css/styles.css" />
</head>
<body>
<div id="shoppingcart">
<h1>Your Shopping Cart</h1>
<?php
echo writeShoppingCart();
?>
</div>
<div id="contents">
<h1>Please check quantities...</h1>
<?php
echo showCart();
?>
<p><a href="index.php">Back to bookshop...</a></p>
</div>
</body>
</html>When I am tryng to add a new item a take
Your Shopping Cart
You have 16 items in your shopping cart
Please check quantities...
Fatal error: Call to undefined function query() in C:\wamp\www\book_store\cart.php on line 33
Could you help me please do it ?
Is there simpler way to do this ??
Thanks a lot