Why doesn't my id shown in the page - php

Question

I was doing the shopping cart tutorial, following http://www.youtube.com/watch?v=WXqbQy9fOp8.
I followed the code closely, but couldn't get the same outcome.
my item id and quantity suppose to be shown when I click add to cart, however, only my quantity shown. Can someone tell me what's is wrong with my code?
Thanks
here is my coding..
<?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("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 == "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("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("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++;
$cartOutput = "<h2>Cart Item $i</h2>";
while(list($key,$value) = each($each_item))
{
$cartOutput ="$key:$value</br>";
}
}
}
?>

Answer 1

You need to append cartOutput in loop. you have re assigned cartOutput in each time.
try like this:
$cartOutput = "";
if(!isset($_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++;
$cartOutput .= "<h2>Cart Item $i</h2>";
while(list($key,$value) = each($each_item))
{
$cartOutput .="$key:$value</br>";
}
}
}

Answer 2

$cartOutput = "<h2>Cart Item $i</h2>";
$cartOutput = "$key:$value</br>"
Problem is in these lines. You are rewriting the cartOutput variable at every step of the loop (thus clearing the 'id').
You should append the data instead:
$cartOutput .= "<h2>Cart Item $i</h2>";
$cartOutput .= "$key:$value"