I came to think of something in my code, which might cause a problem, but I am not sure.
After a user of the site has succesfully put a product in the shopping cart - I set a session = 'something'; - to display to the customer (after I have used headers to redirect to another page, and avoid to add extra products if the user refreshes the page.)
How does sessions work, if lets say - there is another customer on the webpage. If he/she browses to same same page as another customer has just been to, and the session hasent been unset yet - will the new customer then see the: session = 'something'; when visiting the page, but without having put anything into the shopping cart yet?
Or is the session only set on the specific customers client/or session??
I hope I have explained so it can be understood outside my head.