Posted by Tyno Gendo on 05/02/07 11:16

Jerry Stuckle wrote:
> K. A. wrote:
>> On May 2, 11:39 am, Mike Roetgers <miker...@informatik.uni-bremen.de>
>> wrote:
>>> K. A. schrieb:
>>>
>>>
>>>
>>>> I have two servers at work, 'A' for testing and development, and
>>>> server 'B' for production.
>>>> On server A, I wrote a PHP test code to login users then direct them
>>>> to a personalized page. This is done in 3 steps:
>>>> Step 1. Normal http login page.
>>>> Step 2. A page called login.php that takes the posted username,
>>>> stores
>>>> it as $_SESSION["username"], and registers it
>>>> session_register("username"); user is taken to the personalized page
>>>> according to his username and things are fine up to here. (this page
>>>> is not displayed, only for redirecting purposes).
>>>> Step 3. On the personalized page, I check whether session is
>>>> started,
>>>> then display a welcome message with the username. Session variables
>>>> are passed across pages fine.
>>>> Next, I did exactly the same steps on server B; at step 2 (above) user
>>>> is directed to the correct page. But when I get to step 3, the session
>>>> seems to lose or set all its variables to NULL (I checked this using
>>>> var_dump($_SESSION)).
>>>> The codes on server A and B are identical. I copied the php.ini file
>>>> from server A to B (just in case there were differences) and restarted
>>>> Apache on server B. But still, session variables are lost in Step 3
>>>> although the session is still running.
>>>> Any ideas why?
>>> I guess session_register causes the problem.
>>> You should read the "Caution"-boxes
>>> onhttp://php.net/session_register.- Hide quoted text -
>>>
>>> - Show quoted text -
>>
>> I tried removing session register but this turned out worse as it will
>> store the session variable in the first place.
>> I mean, before removing session_register, the value
>> $_SESSION["userid"] was set to NULL, but without session_register, it
>> will not even know that there is something called
>> $_SESSION["userid"] !
>>
>> Still wondering why it will work on one server but not the other!
>>
>
> Which is how it should be. It's quite simple to see if the value has
> been set with
>
> if (isset($_SESSION['userid']) ...
>
> I agree with Mike - the caution is there for a reason! Don't try to mix
> and match.
>

I tried isset myself and got warning notices in my logs about the key
not existing under PHP5... so instead I use:

if ( array_key_exists( 'userid', $_SESSION ) ) {
// do something
}

Am I ok doing this?

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