php accessing sessions array - php

Question

i am still relatively new to php and this site, so i apologise now!This is driving me crazy, i'm trying to add an array to session state for a shopping cart i am piecing together from different bits of code....
$_SESSION['cart_items'] =
array(
'product_name' => $name,
'productId' => $id,
'quantity' => 1
);
^that is the part where it adds to the session state, this works fine as i printr and it comes out like this
Array ( [product_name] => The Ned Rose [productId] => 1 [quantity] => 1 )
This is the bit that i cant get to work. How do i access the product ID's so i can use them in a SQL query to fetch the data to populate the cart...
if(count($_SESSION['cart_items'])>0){
$ids = "";
foreach($_SESSION['cart_items']['productId'] as $id=>$value){
$ids = $ids . $id . ",";
}
Thanks,
EDIT HERE THE CART PAGE
can anyone see where i am going wrong?
<?php
session_start();
$page_title="Cart";
include 'mysql.php';
print_r($_SESSION['cart_items']);
$action = isset($_GET['action']) ? $_GET['action'] : "";
$name = isset($_GET['name']) ? $_GET['name'] : "";
if($action=='removed'){
echo "<div class='alert alert-info'>";
echo "<strong>{$name}</strong> was removed from your cart!";
echo "</div>";
}
else if($action=='quantity_updated'){
echo "<div class='alert alert-info'>";
echo "<strong>{$name}</strong> quantity was updated!";
echo "</div>";
}
if(count($_SESSION['cart_items'])>0){
$ids = "";
$ids = array_keys($_SESSION['cart_items']);
foreach($_SESSION['cart_items'][$id] as $key=>$value){
$ids = $ids . $id . ",";
}
// remove the last comma
$ids = rtrim($ids, ',');
//start table
echo "<table class='table table-hover table-responsive table-bordered'>";
// our table heading
echo "<tr>";
echo "<th class='textAlignLeft'>Product Name</th>";
echo "<th>Price (GBP)</th>";
echo "<th>Action</th>";
echo "</tr>";
$query = "SELECT prodID, prodName, prodPrice FROM product_tbl WHERE prodID IN ({$ids}) ORDER BY prodName";
$result = mysqli_query($db, $query);
$total_price=0;
while ($row = mysqli_fetch_assoc($result)){
extract($row);
echo "<tr>";
echo "<td>".$row['prodName']."</td>";
echo "<td>£".$row['prodPrice']."</td>";
echo "<td>";
echo "<a href='remove_from_cart.php?id=".$row['prodID']."&name=".$row['prodName']."' class='btn btn-danger'>";
echo "<span class='glyphicon glyphicon-remove'></span> Remove from cart";
echo "</a>";
echo "</td>";
echo "</tr>";
$total_price+=$row['prodPrice'];
}
echo "<tr>";
echo "<td><b>Total</b></td>";
echo "<td>£{$total_price}</td>";
echo "<td>";
echo "<a href='#' class='btn btn-success'>";
echo "<span class='glyphicon glyphicon-shopping-cart'></span> Checkout";
echo "</a>";
echo "</td>";
echo "</tr>";
echo "</table>";
}
else{
echo "";
echo "No products found in your cart! Click Here To Return To The Store";
echo "";
}
?>

Answer 1

Use $id as the KEY value when storing the product in the cart:
$_SESSION['cart_items'][$id] =
array(
'product_name' => $name,
'productId' => $id,
'quantity' => 1
);
Then you can use the ID in the foreach loop:
if( count($_SESSION['cart_items']) > 0){
foreach($_SESSION['cart_items']['productId'] as $id => $value){
// Get data for this product
}
}

Answer 2

You could add products to the array so that you didn't need to directly store the "productId" value.
// Set data
$_SESSION['cart_items'][$id] = Array('name'=>$name,'qty'=>1);
// Show session content
foreach($_SESSION['cart_items'] as $id=>$props){
echo 'id='.$id.'<br />';
echo 'name='.$props['name'].'<br />';
echo 'qty='.$props['qty'];
}
// Collect ids (result is an array of ids)
$ids = array_keys($_SESSION['cart_items'];
// Use $ids in a query
$sql = "SELECT * FROM your_table WHERE id_field IN('".implode("','",$ids)."')";

Answer 3

You can use the followings
$_SESSION['cart_items'][] =
array(
'product_name' => $name,
'productId' => $id,
'quantity' => 1
);
or (this will update previously added product id in the cart)
$_SESSION['cart_items'][$id] =
array(
'product_name' => $name,
'productId' => $id,
'quantity' => 1
);
if(count($_SESSION['cart_items'])>0){
$ids = "";
foreach($_SESSION['cart_items'] as $id=>$value){
$ids = $ids . $id . ",";
}
}