Re: Session variables

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Yeah i guess the cookie doesn't need to be stored on the server since it's
in the header anyway.

Thanks for clearing that up.

Tim-Hinnerk Heuer

http://www.ihostnz.com
Charles M. Schulz  - "I love mankind; it's people I can't stand."

2009/2/7 Stuart <stuttle@xxxxxxxxx>

> 2009/2/7 Paul M Foster <paulf@xxxxxxxxxxxxxxxxx>:
> > I'm not too clear on HTTP headers, cookies, and such. So here are
> > questions related to that. Let's say I generate a random number that I
> > want the user to enter in a form. When I generate the number, I store it
> > in a session variable ($_SESSION). When the user submits the form, I
> > check the number they enter with what I've stored in the session
> > variable.
> >
> > Since this session variable survives across page loads (assuming
> > session_start() is appropriately called), how is it stored and recalled?
> >
> > Is it automatically stored as a cookie on the user's system?
> >
> > Or is it stored on the server?
> >
> > And how does a server "get" a cookie?
> >
> > Is it a separate request made by the server to the client?
> >
> > If the value I've asked the user for is *not* stored as a cookie, then
> > is it passed as part of the HTTP submission or what?
> >
> > Thanks for any enlightenment on this.
>
> Session data is stored on the server and tied to a browser using a
> cookie. The cookie contains a random string which uniquely identifies
> a session on the server. The session_start() function handles all the
> details of setting and maintaining that cookie and managing the
> server-side data.
>
> Cookies are transferred between client and server with every request
> in the headers. If you don't have Firefox getfirefox.com. The google
> for the livehttpheaders addon and install that. Turn it on and browse
> your site. You will see the cookies in the headers of both requests
> and responses. Cookies are not stored on the server side, they are
> sent by the client with each request.
>
> No additional HTTP requests are involved when using sessions.
>
> -Stuart
>
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> http://stut.net/
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