The time the cookie expires. This is a
Unix timestamp so is in number of
seconds since the epoch. In other
words, you’ll most likely set this
with the time() function plus the
number of seconds before you want it
to expire. Or you might use mktime().
time()+60*60*24*30 will set the cookie
to expire in 30 days. If set to 0,
or omitted, the cookie will expire at
the end of the session (when the
browser closes).
Taken from:-
http://www.php.net/manual/en/function.setcookie.php
Can anyone explain why is FireFox not deleting cookies with an unspecified expiry time on exit?
I’ve tested in Chrome, Opera and IE they all delete those cookies at exit.
Is this a Firefox bug?
Are you saving your tabs session when exiting Firefox? See this post for more.