This is a two part question.
#1. Lets say I use session_start() on each page, but I don't carry over the session id for those users with cookies disabled. Am right in assuming that each page will create a new session? if so does that bother the server when a bunch of 0kb are created? how long would these empty sessions last?
#2. Upload script, the user uploads a file, it goes to a temp directory, now how long would this files last? And is there a way to check its file type BEFORE it goes to the temp directory?