Find out if a session with a particular id has expired

Question

I am creating an upload feature that stores a user uploaded file on the server with the user\'s session-id as its name. Now, I want to keep this file on the server only till tha

Answer 1

Intervals can be made like this - someone opens your web -> php script is running -> it checks if files is time-outed -> delete time-oted files

And no CRON needed :-)

It is nearly impossible to determinate due to lack of information if user closed or not the browser window ( if he don't closes it but turn sleep mode on and come back in 2 days - session is still active AFAIK ) - only idea to slove this problem in best manner this is to use own session engine with AJAX checking.