Sessions gc_probability

[Anon]

I am trying to find out exactly how does session work:

Basically, if someone could tell me whether this statement is true about session garbage collection:

If in the php.ini file:
gc_probability = 1

Then after 100 times the script has been loaded, the garbage collection routine of PHP comes in. Now, will this delete just that 100th session or will delete all session files in /tmp that have timed-out (i.e. gc_maxlifetime has elapsed since session creation)?????

THANKS in advance!

[[deleted]]

As I understand it, a "percentual probability" means "the percent chance that the gc will be started"

So it is the chance that the gc will be started.
if you set it to 1, there is a 1 pct chance the gc will be started on every run (a 1 in 100 chance)
that does not mean it will only run once every 100 requests.

If you set it to 50 and do 200 requests, then the gc would be started approx. 100 times

And ofcourse the gc will remove all timedout sessions.
There would be no point in just removing the last one.