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?
