[KuraFire]

Originally Posted by amykhar

<snip>

PHP Code:

     $userid = $_COOKIE['userid];  // initialize userid so that it contains a value from a cookie and only from a cookie
     if ($userid == 1) {
     // this is the admin id, let the person do what they want
    ....
 } 


<snip>

You have a little parse error in your code:
$_COOKIE['userid]; will give a parse error, it should be:
$_COOKIE['userid'];

Just FYI that you typo'd

Originally Posted by NTLDR

EG: URL: test.php?debug=1

PHP Code:

  if ($debug)
    // do stuff
  } 


In the above example it checks if $debug is set, ...

Actually, to be entirely precise, it checks whether the variable $debug evaluates to TRUE.

There is a vital difference between a variable that is set and a variable that evaluates to true.

This is important to note, because for starting programmers it's important to know the difference

For instance, if I SET my variable like this:
$debug = 0;

the variable is set fine, and it does exist fine. But it won't evaluate to TRUE, and so that if () will not occur.


If at any point you want to know if a variable is SET, use:

PHP Code:

isset($variable) 


if you want to know if the variable evaluates to TRUE, use:

PHP Code:

if ($variable) 


etc....

(for detailed hacking guidelines, wait a while until vB3 RC1 is out and we have the Hacking Document ready at vB.org )