store products in $_session

I am new to the forum.
I throughly appreciate your help with some code about my problem solving. I designed shopping cart using:

1. product link - code:
//customer data will be stored into $_SESSION
session_start();
$_SESSION['productsid'] = $row["productid"];
$_SESSION['prices'] = $row["price"];

// session data will be transferred via form to:
shoppingcart.php link


2. shopping cart link – code:

// I add some variables for the product’s id and price info and echo them
session_start();
$productid = $_SESSION['productsid'];
$prices = $_SESSION['prices'];
echo "$productid";
echo "$prices";

I tested and this works ok, but my main problem is that I dont know how to transfer more product(s) than one and present all stored in the session. So far I can present only one product.

I tested this:
After presenting the product from the session of the shopping card code, I stored a new product in the session (product link – code). The shopping card link presented the new one product but not the old one. Do I have to use some increment multi-dimensional arrays or similar ?

Can you help me with some code description?
Thank you very much for your help!

 

try this
your product.php

session_start();
$_SESSION['productsid'] = ($_SESSION['productsid'] != '') ? $_SESSION['productsid'] . '|' . $row["productid"] : $row["productid"];
$_SESSION['prices'] = ($_SESSION['prices'] != '') ? $_SESSION['prices'] . '|' . $row["price"] : $row["price"];

PHP:

and your shoppingcart.php

session_start();
$productid = explode('|', $_SESSION['productsid']);
$prices = explode('|', $_SESSION['prices']);
print_r("$productid");
print_r("$prices");

PHP:

 

I would personally store the session data as an array. I would most likely format it something like this:

$_SESSION['cart'][] = array('product_id'=>$product_id, 'product_qty'=>$product_qty, 'product_price'=>$product_price);

Every item they add, you can set another $_SESSION['cart'][] array. You can later loop through them all to get a total or to display the entire cart.