Paul M Foster wrote:
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.
Paul
seeing as you're a voomer here's a very mini explanation
session has an id
a:
session id is passed to a user in the http headers
users client gets sessionid and stores it in a cookie
users client sends cookie with sessionid in it back to website every
page load
b:
on the server a small file is stored in a temp directory containing all
the stuff you've stored in session
the file is named with the session id
when php recieves a request, with a cookie, with a session id in it,
then it grabs the related server side session files, pulls the variables
from it an makes them available to you in $_SESSION.
v simple :p
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