Current Customer / Sessions

[jm-ink]

I'm having trouble finding information about customer sessions. If I wanted to code a page where the user could click a button and get an e-mail listing how many products they have bought (or any arbitrary information from their personal account/database table) would I locate the current user by looking into the session information? If not, how might I be able to access the current customer to do mySQL look-ups on their account information?

[Ajeh]

The customers_id is references as:
$_SESSION['customer_id']

when the customer is logged in ...

[jm-ink]

So just to be clear- also I apologize if this sounds stupid, as I'm not very familiar with web dev- you can access the customer id from that reference from any php file in the server's zen cart folder. i.e. i could just type

echo $_SESSION['customer_id']

as the body for a page linked to the sidebar and it would print the customer's id? (although printing info is not necessarily my goal)

[Ajeh]

Yes, the current logged in customer can be checked with the:
$_SESSION['customer_id']

and when 0, then the customer is not logged in ...