R: [Phplib-users] Is there a way to save sessions between page open and close?

[Gaetano G. <giu...@se...>]

I dunno about security implications, but avoidance of =
double-form-submittal is usually done via javascript, e.g. before =
posting data to the server set a cookie or some other variable on the =
client...

> -----Messaggio originale-----
> Da: php...@li...
> [mailto:php...@li...]Per conto di Herouth
> Maoz
> Inviato: luned=EC 5 luglio 2004 16:33
> A: php...@li...
> Oggetto: [Phplib-users] Is there a way to save sessions between page
> open and close?
>=20
>=20
> I have a captcha system, wherein a php-generated image=20
> generates a number and
> displays it, and the user has to respond with the same number.
>=20
> If he does, a sensitive operation is performed, which we want=20
> to avoid being
> performed several times in a row.
>=20
> We find that if the user clicks the submit button on the form=20
> several times in
> a row, it creates several connections, all of which check the=20
> number and do
> the operation. Since the page does not reload between these=20
> submissions, the
> number does not get replaced.
>=20
> I thought I'd unregister the number directly after I verify=20
> that it's the
> right one, so that the next connection made will not reach=20
> the sensitive
> part, because its comparison will fail.
>=20
> However, since the data is only saved in the session at the=20
> end, when I do the
> page_close(), this is not working. I'd like to be able to=20
> control when the
> session is saved, so that only the first connection will be=20
> able to access
> that number.
>=20
> Any ideas?
>=20
> Herouth
>=20
>=20
> -------------------------------------------------------
> This SF.Net email sponsored by Black Hat Briefings & Training.
> Attend Black Hat Briefings & Training, Las Vegas July 24-29 -=20
> digital self defense, top technical experts, no vendor pitches,=20
> unmatched networking opportunities. Visit www.blackhat.com
> _______________________________________________
> Phplib-users mailing list
> Php...@li...
> https://lists.sourceforge.net/lists/listinfo/phplib-users