Session_ID()

[Annie]

I have a script to check if a session exists, if not then I log the user's info from $_Server
variables into a database (ip address, time, etc.).

The problem is that the test:

if(!session_id( )) // if there is no session started
{
session_cache_l imiter('nocache ');
session_cache_e xpire (20);
session_start() ;

include_once ('../DB_functions.ph p');

....the the other stuff, like logging goes here...


doesn't seem to work...the test always produces true...is there something I am missing?

Thanks,

Annie

[Guest]

Re: Session_ID()

> The problem is that the test:[color=blue]
>
> if(!session_id( )) // if there is no session started
> {
> session_cache_l imiter('nocache ');
> session_cache_e xpire (20);
> session_start() ;[/color]
[color=blue]
> doesn't seem to work...the test always produces true...is there something[/color]
I am missing?[color=blue]
>[/color]

Try :
print ini_get('sessio n.auto_start');

If it is set, they your session is already started and
you will always have a session_id. You would then need
to turn it off in php.ini or .htaccess


_______________ _______________ ______
Wil Moore III, MCP | Integrations Specialist | Senior Consultant
Business | Personal

[Annie]

Re: Session_ID()

laidbak69@hotma il.com wrote:
[color=blue][color=green]
>>The problem is that the test:
>>
>>if(!session_i d()) // if there is no session started
>>{
>> session_cache_l imiter('nocache ');
>> session_cache_e xpire (20);
>> session_start() ;[/color]
>
>[color=green]
>>doesn't seem to work...the test always produces true...is there something[/color]
>
> I am missing?
>
>
> Try :
> print ini_get('sessio n.auto_start');
>
> If it is set, they your session is already started and
> you will always have a session_id. You would then need
> to turn it off in php.ini or .htaccess
>
>
> _______________ _______________ ______
> Wil Moore III, MCP | Integrations Specialist | Senior Consultant
> Business | Personal
>
>[/color]
Thanks for you advice,

ini_get('sessio n.auto_start') returns 0, so I assume that the auto start is off. The problem is
that the If statement runs as if there is never a session.

When I print the value of session_id () it produces a value (a session id), but !session_id() always
is true?

Annie

[Guest]

Re: Session_ID()

> >>The problem is that the test:[color=blue][color=green][color=darkred]
> >>
> >>if(!session_i d()) // if there is no session started
> >>{
> >> session_cache_l imiter('nocache ');
> >> session_cache_e xpire (20);
> >> session_start() ;[/color]
> >
> >[color=darkred]
> >>doesn't seem to work...the test always produces true...is there[/color][/color][/color]
something

What I have found is interesting. You can't evaluate 'session_id()' before
calling
session_start() because session_start() is what restores the value that
session_id()
would return.

I know the manual referrs to using session_id() before session_start() ,
however,
it is not meant to say that you can retrieve that value... it means it can
be SET
only before session_start() is called.

_______________ _______________ ______
Wil Moore III, MCP | Integrations Specialist | Senior Consultant
Business | Personal

[Chung Leong]

Re: Session_ID()

I think you've misinterpretted the purpose of session_start() . While the
function does create a new session when there isn't one, its primary
function is to initialize the session mechanism (for instance, populate the
$_SESSION array). It's best to interpret the "start" in session_start as
"from this point forward, the script will start making use of session
variables. The function that performs the opposite is session_write_c lose().

I suggest using a session variable to note whether the user info has been
saved or not, as follows:

<?php

session_start() ;

if(!@$_SESSION['user info saved']) {
... save info in database ...
$_SESSION['user info saved'] = true;
}

Uzytkownik "Annie" <AnnB@newsgroup .net> napisal w wiadomosci
news:cCS1c.4554 8$PR3.929733@at tbi_s03...[color=blue]
> I have a script to check if a session exists, if not then I log the user's[/color]
info from $_Server[color=blue]
> variables into a database (ip address, time, etc.).
>
> The problem is that the test:
>
> if(!session_id( )) // if there is no session started
> {
> session_cache_l imiter('nocache ');
> session_cache_e xpire (20);
> session_start() ;
>
> include_once ('../DB_functions.ph p');
>
> ...the the other stuff, like logging goes here...
>
>
> doesn't seem to work...the test always produces true...is there something[/color]
I am missing?[color=blue]
>
> Thanks,
>
> Annie[/color]

[Annie]

Re: Session_ID()

Chung Leong wrote:
[color=blue]
> I think you've misinterpretted the purpose of session_start() . While the
> function does create a new session when there isn't one, its primary
> function is to initialize the session mechanism (for instance, populate the
> $_SESSION array). It's best to interpret the "start" in session_start as
> "from this point forward, the script will start making use of session
> variables. The function that performs the opposite is session_write_c lose().
>
> I suggest using a session variable to note whether the user info has been
> saved or not, as follows:
>
> <?php
>
> session_start() ;
>
> if(!@$_SESSION['user info saved']) {
> ... save info in database ...
> $_SESSION['user info saved'] = true;
> }
>
> Uzytkownik "Annie" <AnnB@newsgroup .net> napisal w wiadomosci
> news:cCS1c.4554 8$PR3.929733@at tbi_s03...
>[color=green]
>>I have a script to check if a session exists, if not then I log the user's[/color]
>
> info from $_Server
>[color=green]
>>variables into a database (ip address, time, etc.).
>>
>>The problem is that the test:
>>
>>if(!session_i d()) // if there is no session started
>>{
>> session_cache_l imiter('nocache ');
>> session_cache_e xpire (20);
>> session_start() ;
>>
>> include_once ('../DB_functions.ph p');
>>
>>...the the other stuff, like logging goes here...
>>
>>
>>doesn't seem to work...the test always produces true...is there something[/color]
>
> I am missing?
>[color=green]
>>Thanks,
>>
>>Annie[/color]
>
>
>[/color]
Thanks...yeah the manual does not mention that you need to first run session_start before you check
session_id, and that does not match the way they suggest using it. I will use a session variable to
track the first entry into a session.

Thanks again...

[Tim Van Wassenhove]

Re: Session_ID()

On 2004-03-06, Annie <AnnB@newsgroup .net> wrote:[color=blue]
> Chung Leong wrote:
>[color=green]
>> I think you've misinterpretted the purpose of session_start() . While the
>> function does create a new session when there isn't one, its primary
>> function is to initialize the session mechanism (for instance, populate the
>> $_SESSION array). It's best to interpret the "start" in session_start as
>> "from this point forward, the script will start making use of session
>> variables. The function that performs the opposite is session_write_c lose().
>>
>> I suggest using a session variable to note whether the user info has been
>> saved or not, as follows:
>>
>> <?php
>>
>> session_start() ;
>>
>> if(!@$_SESSION['user info saved']) {
>> ... save info in database ...
>> $_SESSION['user info saved'] = true;
>> }
>>
>> Uzytkownik "Annie" <AnnB@newsgroup .net> napisal w wiadomosci
>> news:cCS1c.4554 8$PR3.929733@at tbi_s03...
>>[color=darkred]
>>>I have a script to check if a session exists, if not then I log the user's[/color]
>>
>> info from $_Server
>>[color=darkred]
>>>variables into a database (ip address, time, etc.).
>>>
>>>The problem is that the test:
>>>
>>>if(!session_ id()) // if there is no session started
>>>{
>>> session_cache_l imiter('nocache ');
>>> session_cache_e xpire (20);
>>> session_start() ;
>>>
>>> include_once ('../DB_functions.ph p');
>>>
>>>...the the other stuff, like logging goes here...
>>>
>>>
>>>doesn't seem to work...the test always produces true...is there something[/color]
>>
>> I am missing?
>>[color=darkred]
>>>Thanks,
>>>
>>>Annie[/color]
>>
>>
>>[/color]
> Thanks...yeah the manual does not mention that you need to first run session_start before you check
> session_id, and that does not match the way they suggest using it. I will use a session variable to
> track the first entry into a session.[/color]

From http://www.php.net/manual/en/ref.session.php

Note: Please note when working with sessions that a record of a session
is not created until a variable has been registered using the
session_registe r() function or by adding a new key to the $_SESSION
superglobal array. This holds true regardless of if a session has been
started using the session_start() function.

--

http://home.mysth.be/~timvw