[RESOLVED] hw to check if session already exists..

alpachino

hi guys. i am using session_start(); at every page. but hw can i determine if session has been not initialised & should start new session?

NogDog

session_start() will, in fact, "initialize" a new session if it did not receive a session cookie from the user. However, I'm not sure if that's what you mean. Perhaps you want to determine if a user is logged in? If so, you'll want to store some value in the $SESSION array that indicates they have successfully logged in. Then each page will need to check if that value is appropriately set, e.g.:

<?php
session_start();
if(empty($_SESSION['user_id']))
{
   // send to login page or whatever is appropriate....
   exit();
}
// rest of page . . .
?>

halojoy

alpachino wrote:
hi guys. i am using session_start(); at every page.
but hw can i determine if session has been not initialised
& should start new session?

as I recall it,
there is some code (trick) for this in PHP Manual
.. see readers comments at [man]session_start/man
.... or was it some of the other session_functions .. maybe

This can be useful to avoid messages like:
E_NOTICE: session already started at line nn in mypage.php

There is defintely a way to check this.
I am almost 100% NogDog remembers howto. And can tell us.

Best is of course, if you can arrange your scripts, so that this will never happen.
That you use session_start() 2 times,
when session was already started some other page included.

I agree this can be very tricky sometimes,
especially when using many conditional includes / require( 'file.php')

regars 🙂
halojoy

dclamp

to show all sessions, use print_r

print_r($_SESSION);

Weedpacket

You can see if [man]session_id[/man] returns something other than an empty string, or if the SID constant is defined.

But it's a little worrying if your architecture is so hairy you have to check.

ruebezahl

Weedpacket;10860694 wrote:
But it's a little worrying if your architecture is so hairy you have to check.

This might just be the dumbest thing i read this week. Of course it is NOT "worrying" if you double and triple-check your environment - in fact, redundant querys are a pretty good sign of well-written code ... this applys to about every language i know of because computing time is cheap - debugging errors which occur because of too few querys are not. Its not 1990 anymore, computers can do these querys withing microseconds, if not less.

Ah and btw : have a look into kernel-driver, you'll be overwhelmed by redundant querys .... but do not "worry" about these matters yet, it appears you still have a looooogn way to go 😉

bradgrafelman

ruebezahl wrote:
This might just be the dumbest thing i read this week.

Oh? You should try re-reading your own post. 🙂

ruebezahl wrote:
do not "worry" about these matters yet, it appears you still have a looooogn way to go

As someone's first post here, I would have thought you'd do anything other than antagonize one of the smartest members of the community and moderator team.

I would have thought you'd be civil and, even if you disagree with something he posted years ago, be able to state your own opinion in an intelligent manner. But do not "worry" about these matters yet, it appears you still have a looooong way to go. 😉

(Also note that you won't have the chance to get there at all if you keep posting like that.)

ruebezahl

bradgrafelman;10984705 wrote:
Oh? You should try re-reading your own post. 🙂

Im sorry, did i attack your second account which you use to troll everyone? Too bad.

bradgrafelman;10984705 wrote:
As someone's first post here, I would have thought you'd do anything other than antagonize one of the smartest members of the community and moderator team.

I would have thought you'd be civil and, even if you disagree with something he posted years ago, be able to state your own opinion in an intelligent manner.

Yes i thought was made out of candy as a toddler, but then i grew up and reality hit me.

bradgrafelman;10984705 wrote:
But do not "worry" about these matters yet, it appears you still have a looooong way to go. 😉

Yeah, well .... that doesnt even make any sense. But i guess thats your tactic.

bradgrafelman;10984705 wrote:
(Also note that you won't have the chance to get there at all if you keep posting like that.)

Also note that nobody gives a flying ****.

ruebezahl

ruebezahl;10984707 wrote:
Yes i thought was made

"the world is made"