id is not defined in my shopping cart - php

Question

I was doing a shopping cart tutorial,
I met with one error stating that my item_id is not defined
for $cartOutput .= "Item ID: " . $each_item['item_id']."<br>";
However,
I have defined the item_id.
here is my code.
Can someone tell me what's wrong?
<?php
//script error reporting
error_reporting(E_ALL);
ini_set('display_errors','1');
?>
<?php
if (isset($_POST['pid'])) {
$pid = $_POST['pid'];
$wasFound = false;
$i = 0;
// If the cart session variable is not set or cart array is empty
if (!isset($_SESSION["supermarketcart"]) || count($_SESSION["supermarketcart"]) < 1) {
// RUN IF THE CART IS EMPTY OR NOT SET
$_SESSION["supermarketcart"][] = array(1 => array("item_id" => $pid, "quantity" => 1));
} else {
// RUN IF THE CART HAS AT LEAST ONE ITEM IN IT
foreach ($_SESSION["supermarketcart"] as $each_item) {
$i++;
while (list($key, $value) = each($each_item)) {
if ($key == "item_id" && $value == $pid) {
// That item is in cart already so let's adjust its quantity using array_splice()
array_splice($_SESSION["supermarketcart"], $i-1, 1, array(array("item_id" => $pid, "quantity" => $each_item['quantity'] + 1)));
$wasFound = true;
} // close if condition
} // close while loop
} // close foreach loop
if ($wasFound == false) {
array_push($_SESSION["supermarketcart"], array("item_id" => $pid, "quantity" => 1));
}
}
header("location: cart.php");
exit();
}
?>
<?php
//if user choose to empty cart
if(isset($_GET['cmd']) && $_GET['cmd'] == "emptycart")
{
unset($_SESSION["supermarketcart"]);
}
?>
<?php
//render the cart for user to view
$cartOutput = "";
if(!isset($_SESSION["supermarketcart"]) || count($_SESSION["supermarketcart"]) < 1 ){
$cartOutput .= "<h2 align = 'center'> Your shopping cart is empty</h2>";
}
else
{
$i = 0;
foreach ($_SESSION["supermarketcart"] as $each_item)
{
$i++;
$item_id = $each_item['item_id'];
$sql = mysql_query("SELECT * FROM supermarket WHERE id = '$item_id' LIMIT 1");
while($row = mysql_fetch_array($sql)){
$product_des = $row_supermarketDetails['description'];
$price = $row_supermarketDetails['price'];
}
$cartOutput .= "<h2>Cart Item $i</h2>";
$cartOutput .= "Item ID: " . $each_item['item_id']."<br>";
$cartOutput .= "Item Quatity: " . $each_item['quantity']."<br>";
$cartOutput .= "Item Name: " . $product_des."<br>";
$cartOutput .= "Item Price: " . $price."<br>";
}
}
?>

Answer 1

Your array structure is complicated, and you have a multidimensional array like sp
array (
array (
"item_id" => $ pid, "quantity" => 1
)
)
So you need adjust your code
if (!isset($_SESSION["supermarketcart"]) || count($_SESSION["supermarketcart"]) < 1) {
// RUN IF THE CART IS EMPTY OR NOT SET
$_SESSION["supermarketcart"][] = array(1 => array("item_id" => $pid, "quantity" => 1));
}
add [] to your $_SESSION["supermarketcart"] statement like you see above