Need to use $_GET on PortalPage

[matzebmn]

Hello together.
First: sorry for my bad english

I´m using actual PFSense version about one year with Captive Portal.
Now i´m trying to do something like this:
LOGIN via URL that the user recives as an e-mail
eg:
www.hotspot.de/index.php?webvoucher=12345678
user has just to klick the link and starts browsing at the PortalPage with filled in WebVoucher

<form method="post" action="$PORTAL_ACTION$">
 >

</form>

I think PFSense doesn´t allow or parse $_GET
How can i do

At /etc/inc/captiveportal.inc

function portal_allow($clientip,$clientmac,$username,$password = null, $attributes = null, $ruleno = null,$valuetophp) {
global $redirurl, $g, $config, $type, $passthrumac, $_POST, $_GET;

i added method and variable

HELP :)
Thanks.
Greetigs Matze

[hiwj]

I have been looking at this a lot too. I want to switch languages with a querystring and read it with a $_GET, but it seems to ignore it. I looked at the code behind the Captive Portal, but can't find where it ignores it, which is rather odd because it reads the redirurl value.

I have tried to hard code test values in the inc files, but my pages don't seem to read them. Perhaps it would be an idea to create a test PHP page to see if this can read them, and therefore get an idea where these values are being dropped.