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Posted by Kimmo Laine on 11/08/06 11:10
"shadowshifter" <oliver.merhof@googlemail.com> wrote in message
news:1162983090.710184.276230@i42g2000cwa.googlegroups.com...
> Hello,
>
> does anybody know what the use of the exclamation mark in "!isset" is?
It is one of the basic operators, it performs a boolean NOT operation to
given value. Ie. if the value is FALSE, the NOT operator will make it TRUE,
and vice cersa, TRUE will become FALSE
> It seems that the script below is only willing to work properly if used
> without "!".
You are completely changing the functionality of the script to something it
was never intended.
> extract($_SESSION);
> if(!isset($password))
> die ("Access denied");
This horrible piece of script registers all session variables as variables,
then checks weather the session variable called 'password' exists,
assumingly it is only present once the user has logged in. If it does not
exists, the script stops giving the error message 'access denied'. Once you
remove the exlamation mark, you are no longer checking weather the user is
logged in or not - in fact you are throwing out anyone who is. If this is
what you want, then you can remove the entire section of code if it is all
the same to you. Not that it was really secure in the first place...
--
"Ohjelmoija on organismi joka muuttaa kofeiinia koodiksi" - lpk
http://outolempi.net/ahdistus/ - Satunnaisesti pδivittyvδ nettisarjis
spam@outolempi.net | rot13(xvzzb@bhgbyrzcv.arg)
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