session vs. cookie? page expire ?

[blackhorse]

session id is a cookie.

I am using session to save the information about a shopping cart. and in every page, i will display how many items in the shopping cart. I want this value to be updated as I add or remove items from the cart. I can use session value or cookie here.

session_start() will expire the page? so if i use the session, next time i visit this page, due to the page expired, it will display the new value. But if i use cookie, if i don't expire that page using header, then i may get old cookie value displayed when next time i revisit this page.

[blackhorse]

For the files upload, files (directory) delete, files (diretory) rename etc. On windows platform vs. linux platform, what issues I need to be ware when I move a site from linux to windows, specially for the files management part.

For example, I remember some http upload scripts use var/tmp to hold some files, if I move it to windows platform, what should I do?

[blackhorse]

For the files upload, files (directory) delete, files (diretory) rename etc. On windows platform vs. linux platform, what issues I need to be ware when I move a site from linux to windows, specially for the files management part.

For example, I remember some http upload scripts use var/tmp to hold some files, if I move it to windows platform, what should I do?