Back problem with POST variables

pilot

Hi all!
We have a problem with the POST variables.
We have a form that sends to a php script his variables with POST method. The php script insert the values in a MySQL Database and then shows a message screen. The problem is when we click to the back button of the browser appears a page telling variables are expired. Press reload to repost from data.

How can we solve that problem? We can't send all the varialbles with the GET method beacause there are a lot.

Example, we have the next 3 files:

intro.phtml

... <form action="script.php method="post">
Write: <input type="text" name="test_var">
...
</form>
...

script.php

...
INSERT INTO testing_db (something) VALUES ('$test_var'); // $test_var is the var that comes from the form.

// Now we redirect the user to a message screen.
header ("Location:../msgs/OK.html");

OK.html

<H1>Operation Done</H1>

Thanks in advance.

PiLoT & Jazze

toma42

add a header like
$exp_gmt = gmdate("D, d M Y H:i:s", time() + 30 * 60) . " GMT";
$mod_gmt = gmdate("D, d M Y H:i:s", time()) . " GMT";

header("Expires: " . $exp_gmt);
header("Last-Modified: " . $mod_gmt);

This code is taken from phplib session.inc, slightly modified.

pilot

Thanks a lot!!
but ... it still failing.

Our platform:
Linux 2.2.x
PHP 4.0.3pl1
Apache 1.3.17

The PHP's man say that track-vars is allways enabled with our version of PHP. If we execute phpinfo() it doesn't appear. And least we can't access to the $HTTP_POST_VARS but the vars sended trough the form works fine.

Any idea???

Thanks again.

Anon

If you can't see the variables in $HTTP_POST_VARS, then track_vars is NOT on.

Try putting the <?php_track_vars?> directive at the top of your script.

-- Rich Rijnders
-- Irvine, CA US

toma42

Dude, my solution is different...it has nothing to do with track vars or populating data again, instead, my solution allows the browser to store tha data for X seconds.

Check all the headers you're sending. Use
http://webtools.mozilla.org/web-sniffer/
to check what headers your pages are sending.

Anon

Can you have your intro.phtml file post back on itself with $PHP_SELF and then process the data there (in intro.phtml)? And then, if successful, you could header("Location: wherever")

pilot

We have different files because we want to separate web design and web programming.

Thanks

pilot

Thanks again Tom,

Well, we've observed that the POST vars is not a problem with simple forms like but yes when we use sessions.
The headers obtained are:
HTTP/1.1 302 FoundCRLF
Date: Fri, 30 Mar 2001 10:39:05 GMTCRLF
Server: Apache/1.3.17 (Unix) PHP/4.0.3pl1 mod_ssl/2.8.0 OpenSSL/0.9.6CRLF
X-Powered-By: PHP/4.0.3pl1CRLF
Set-Cookie: PHPSESSID=feeafb3c8b364ff285a033dc16e288a5; path=/CRLF
Expires: Thu, 19 Nov 1981 08:52:00 GMTCRLF
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0CRLF
Pragma: no-cacheCRLF
Location: ../../htdocs/zona_profesor/login.phtmlCRLF
Connection: closeCRLF
Content-Type: text/htmlCRLF

And for a simple form:
HTTP/1.1 200 OKCRLF
Date: Fri, 30 Mar 2001 10:37:42 GMTCRLF
Server: Apache/1.3.17 (Unix) PHP/4.0.3pl1 mod_ssl/2.8.0 OpenSSL/0.9.6CRLF
X-Powered-By: PHP/4.0.3pl1CRLF
Connection: closeCRLF
Content-Type: text/htmlCRLF

Pay attention at:
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0CRLF
Pragma: no-cacheCRLF

Is it that the problem?? How can we change it?

Anon

then include the file, like:
<? require "script.php"; ?>
at the top of the form page, before html.

🙂

(I do hope you find another way around this problem. I never did)