Session Problem

doobster

Hello, I have a really weird session problem that I can't figure out.

I have a script that creates a random image (randomimage.php). This script generates a random number ($rand_num) and registers it with the session.

I call randomimage.php from another script using <img src=randomimage.php> This same script needs to use the session variable $rand_num in it. However, in the calling script the session variable $rand_num always displays the previous variable and not the current one.

The calling script looks like this:

<?php
session_start();
?>
<html>
<head>
</head>

<body>
<img src="randomimage.php">
<br>
<?
session_register("rand_num");
echo $rand_num;
?>
</body>
</html>

Does anyone know the cause of this problem?

ednark

well first off session_register() has been deprecated.. the community recommends you use $_SESSION directly now...

if you are using and earlier version of PHP then you may be stuck using session_register()

if you are stuck using it, then you must first define the variable, THEN register it

session_start()
$save_me = 1;
session_register('save_me');

it is recommended you simply use this instead:

$_SESSION['save_me'] = 1;

doobster

Switching between session_register and $_SESSION does not help with my problem.

Maybe I didn't eloborate enough.

I have two scripts randomimage.php and test.php. randomimage.php creates the random image and sets a session variable $_SESSION['rand_num'];

test.php calls this script with the code I provided in my first post using an <img src>

After that call I try to display $_SESSION['rand_num'] however, the variable is not the same one returned after the <img src> call, it returns the variable from the previous <img src> call.

ednark

you may be having a timing problem...

if you are calling <image.php> in the SRC of you r image... it will actually be processed AFTER the entire page has been finished by php... sent to the browser.. and the browser gets around to requesting the image ... which is actually a php script image.php

so image.php will run well after your script has finished executing...

so you may have to so somehting like:

$id = 'foo';
echo "<img src='randomimage.php?id=$id' />";

and randomimage.php may decide what to do based on id passed via GET

i don't know why you need $id stored so I don't know if this solution will work for you

doobster

I attempted to pass a get variable as suggested, but this had no affect.

What I might simply do is set the session variable in the calling script and just access it from randomimage.php

ednark

that sounds like a good solution.. that should work as well