[vox-tech] when is an html image "sent"?

[Peter Jay Salzman]

On Sat 17 Dec 05, 12:15 AM, Rod Roark <rod at sunsetsystems.com> said:
> On Friday 16 December 2005 11:24 pm, Peter Jay Salzman wrote:
> > ... No matter what I try, though, I
> > can't access sessions from the captcha2.php file.  I guess it must interfere
> > with the image being sent to the client.
> 
> Oooh.  It must be that there's no mechanism for the browser to send
> the cookie (which contains the session ID) when it requests an
> image.  Sorry I caused you so much trouble.
> 
> I think what may work is to send the session ID in the URL.  That is,
> construct the image URL like this:
> 
>   $url = 'captcha2.php?' . session_name() . '=' . session_id();
> 
> and then your form requests the image with:
> 
>   <img src='<?php echo $url ?>'>
> 
> or whatever the equivalent is with Smarty.
> 
> I have not tried this, it's just my best guess from reading the docs.
 
Thanks Rod!

Unfortunately, it's still not working.  Here's what I tried:


Smarty template/web page "view_by_permalink.php":

   $smarty->assign('sessionId', session_id());
   $smarty->assign('sessionName', session_name());

   <img src="captcha2.php?{$sessionName}={$sessionId}" alt="validation string" />

captcha2.php:

   session_id( $_REQUEST['PHPSESSID'] );
   start_session();
   $_SESSION['captcha'] = $cmntPass;



Using error_log(), I determined that in captcha2.php, $_REQUEST['PHPSESSID']
is the correct session ID.  But something isn't right because if I stick

   error_log('hello world');

in captcha2.php before start_session(), the message appears in my error log.
But if I stick it in after start_session(), it doesn't appear.  So PHP seems
to be very unhappy with the start_session() line.

Needless to say, 'captcha' is an undefined $_SESSION index in the receiving
form.

I'm really on ground here.  I'm reading, but there's enough documentation to
drown in.

Have any idea on how to proceed?

Pete