Session-Based Shopping Cart

[ballouta]

Hello,

 

I am studying a sample application : Session Based shopping cart from a book.

Actually I need to implement this code but with few changes.

The sample supposes an exisiting file that contains the catalog data.

e.g.:

101:AA Batteries (pack of 2) :2.99  etc...

 

The code begins with looking for the catalog file and if found, it adds it to an associative array called $catalog. Then it prints the items:

<?php
foreach ($catalog as $k => $v)
{
...
echo "<b>" . $v['desc'] . "</b>";
echo "Price per unit:" . $catalog[$k]['price'];
...
}

 

Till here i do NOT need any of this code because my items are stored in a DB.

But kindly i want to ask my first question then i post the others

 

What is $K and $v? i mean how do they work here (foreach ($catalog as $k => $v))?

 

thank you