Passing session variable

chrima

Hi all,
I have a page called session_test1.php

<?
session_start();
session_register('cart_id');
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body>
Test Sessions:<br>
<br>
<a href="session_test2.php">Next</a>
</body>
</html>

What i want to do is pass the session variable to session_test2.php but is is not echoing the variable.
It displays in the url (eg. session_test2.php?sess=23r7ff8cv99xvc89cv8cvv1 but not the page itself.

Here is the code for session_test2.php:

<?
session_start();
$cart_id = $_SESSION['cart_id'];
echo "$cart_id";
?>

Any ideas why?
Cheers,
chrima

Weedpacket

Um, what is it supposed to contain? You're not giving it a value anywhere. You register cart_id on page 1, but you never use it. I mean, if it's the session id you want then it's [man]session_id[/man] you want.

PS: Don't mix session_register() and $_SESSION[]. Use one or the other. Preferably the second.

batman

Weedpacket, what do you mean when you say to not mix up session_register() and $_SESSION[] together?? Yes, he is using them both but on two totally different pages. What he is trying to do is set the session on page one, then call it on page two.

But like weedpacket said, unless you have a page that posts the variable "cart_id" to the first page, then it's registering an empty variable. So that's why when you try and echo the session on the second page it's not there.

Is there another page before session_test1.php?

-Blake

Weedpacket

Originally posted by batman
Weedpacket, what do you mean when you say to not mix up session_register() and $SESSION[] together?? Yes, he is using them both but on two totally different pages. What he is trying to do is set the session on page one, then call it on page two.

Yes, that's true; however, I'm thinking about the job of building these pages - if you use session_register() on one page and $SESSION[] on the other, you're going to have to keep using session_register() on one page and $_SESSION[] on the other and not let yourself get mixed up as to which page is which - and who needs that extra bother?

Also, if the site gets run in an environment where register_globals is turned off, some pages (those using $_SESSION[]) will have session data and some won't. More fun and games for the whole family.

jassh

yup.. i totally aggree with weedpacket...
using super globals is the way..
coz i tried using the session_register()..
it doesnt always work..
and of course.. using $_SESSION[register] = $var
is always recomended in most book i read

anyway , just wanna ask you guys..
can we add any passable info in the session file..
i mean.. i want to add multiple value in to the session file..
can it be done..??

i noticed, if i create a session..
some weird file wil also be created..
now.. is there anyway i can store info on that session file..
and pass it around..
like i would on a cookie??

and what good soes a session id does..
aything in particular we can do with it??

one last one..
if i have the below code..

ob_start();
session_start();


$_SESSION['name'] = "myname";
$_SESSION['level'] = "admin";
$_SESSION['last_page'] = $lastpage;

does this means..
that 3 session has being created..
or just one session..??
or is it 1 session but 3 session file (those wierd file..)

hope some one can explain..
just askin..

have a nice day fellas..

-jassh

batman

Yes, that is why whenever I create sessions, I do it this way:

session_register('variable');
$_SESSION['variable'] = $variable;

Jassh, as for your question, yes, the way you have it, it is creating 3 session variables. Then you can call each of those sessions individually on any page, until there is a session_destroy();

-Blake

jassh

okay.. thanks blake.. i get it..
3 session created eh.. kewl..

but what i dont get is that,
why are you repeating the session creating process twice..
or is it that you are just showing diffrent way of u doing it??

anyway.. i went to this seminar..
and they did mention about session stealing...
anybody wants to give opinion about this??

anyway, sorry to budge in like this..
i hope the thread starter doesnt mind.. 🙂

-jassh

batman

Yes, when I register variables I do it both ways. Mainly for the fact that I do work for different people and instead of trying to figure out if register_globals is on or off, this way it will work no matter what for anybody.

Just my way of doing it.
-Blake

Weedpacket

Originally posted by batman
Yes, when I register variables I do it both ways. Mainly for the fact that I do work for different people and instead of trying to figure out if register_globals is on or off, this way it will work no matter what for anybody.

Just my way of doing it.
-Blake

It seems a bit odd; so what you're doing is (a), creating a variable called $variable (assuming that register_globals is turned on), containing the session data stored under the name 'variable'. Then you're storing the value of that variable in the session data under the name 'variable'.
$_SESSION[] will work whether register_globals() is turned on or off; the only time it won't work is if it's being hosted on a box running a version of PHP older than 4.1.

In fact, I tried your code in an environment with register_globals turned off, and it blew up with error messages; starting with an "Uninitialised variable" notice.

ereptur

I have always coded my pages in the way that batman does and they have always worked fine. In fact, I've found sometimes that if I don't use that exact method the variable doesn't get set into the session cookie on the server.

I know you should never HAVE to do it that way, but I seem to have to every once in a while.

jassh

yeah.. same here..
i tried it out on my pc, and got some errror...

i guess.. the superglobal way (the $_SESSION['register'] = $var😉is good in a way to go coz
i found out that most servers or hosting company
have the register_globals turned off... (that sounded kinky)

by the way, i think that the manual
and most book i read stated that
i should not use session_register() if i use $_SESSION['register']
or vise versa....

still, this session stuff is and alwyas gonna be interesting..
any idea where i can get learn more on it..
coz i bought some book, and it doesnt say much,
except for the explanation simmilar to the manual..

just a thought..

-jassh

batman

Well, everyone has their own way of setting sessions, and mine seems to work just fine for everything I use it for. I also agree that there should only be one way of setting them, $_SESSION["$var"]; But who gives? Computers aren't as forgiving as a person, so treat them as a child.

clandestine555

hrm... in response to an earlier post, someone said using session_register("blah"); creates another session. no, it does not.

you begin 1 session and one session only by using session_start();, or the first session_reguster(). you can register as many variables as needed, those are stored on the server in one file, the session file. so in effect, you might have 50 variables, all allocated to 1 session, which is why some people append the sid to the URL.

in response to the first post, you're trying to echo a variable that's been set, but does not have a value associated with it. and secondly, most people use ?sid=blahblah, instead of sess, all depends on you tho. so try setting a variable $blah = "test"; and see if it comes out on the next page.

page 1:

<?
session_start();
session_register("cartid");

$cartid = session_id();
$SESSION["cartid"] = $cartid;
//now for the link:
echo "<a href='page2.php?sid=". <? echo $SESSION["cartid"]; ?> ."'>click me</a>";
?>

page 2:

<?
session_start();
echo $_SESSION["cartid"];
?>

note, i didn't test this, this is just what i'd do. should work right off.