CGI::Session flush() functions

priti has asked for the wisdom of the Perl Monks concerning the following question:

Hello Monks, Can some one clear my doubt i.e If after i write to session should i flush() it always?? What exactly flush() function do ...Overwrite the previously created file or simply append the new registered parameter by $session->param('k','v'); ? Regards

Comment on CGI::Session flush() functions

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Re: CGI::Session flush() functions by moritz (Cardinal) on Aug 20, 2008 at 10:59 UTC
`flush()` writes the session object to disk (or database, or whatever you use as a storage backend). When you store a new param in a session it will be lost after the end of your scriptunless you call `flush`.	[reply] [d/l] [select]
Re^2: CGI::Session flush() functions by jettero (Monsignor) on Aug 20, 2008 at 12:37 UTC
I think it actually tries to flush when the Session object goes out of scope. I believe it fails to flush only when the script dies unexpectedly. UPDATE: No doubt. Explicitly flushing is better in every way. I was just saying that there are occasions where it will flush on its own, not terribly reliable, but they exist. -Paul	[reply]
Re^3: CGI::Session flush() functions by moritz (Cardinal) on Aug 20, 2008 at 12:41 UTC
Not only when it dies unexpectedly. I had a whole lot of cases of normal exits where it also failed to flush the session, which is why I recommend to always manually call `$session->flush()`. The CGI::Session maintainers know of these problems, and encourage you to not rely on auto flushing.	[reply] [d/l]