[SOLUTION] What's $PORTAL_ACTION$ ? Need help with custom PHP page.

[Sgrud]

I'm having trouble creating a custom portal page that includes some validation:
The validation works, but when the code continues by setting the header to $PORTAL_ACTION$, I'm redirected to http://<captiveportal>:8000/$, and then http://<captiveportal>:8000/captiveportal-p.php?redirurl= .

I don't understand how $PORTAL_ACTION$ and $PORTAL_REDIRURL$ work.  I'm also new to PHP.

Here's what I have.  I'd appreciate any and all corrections (getting it to work or just cleaning up any bad or unnecessary code). Thanks in advance!

index.html to redirec to custom p.php

		Redirecting . . .

custom p.php

	$message = ""; // set default error message to empty
	$redirurl = $_GET['redirurl']; // get redirurl from URL

	// if form submitted, validate
    if ($_POST['submitted'] == 1)
	{
		$pattern = '/.*@.*\..*/';
		$email = $_POST['email'];
		// if valid, continue
		if (preg_match($pattern, $_POST['email']) > 0)
		{
            header("location: $PORTAL_ACTION$");
        }
		// if invalid, set error message to be displayed
        $message = "E-mail address must be valid!";
	}
?>

## ACCEPTABLE USE POLICY

		<iframe src="captiveportal-aup.html" style="width:90%;height:65%;margin-bottom:20px;"></iframe>
		$message";?>

<form method="post" action="<?echo $_SERVER['PHP_SELF'] . " ?redirurl=" . $redirurl;?>">
			Please enter your e-mail address: 

### By clicking 'Continue' you agree to the Acceptable Use Policy.

		</form>

(NOTE: the code is incomplete; I realize I'm not actually doing anything with the e-mail address as of yet.)</captiveportal></captiveportal>

[Sgrud]

With some help from these two posts I've manged a solution:
http://forum.pfsense.org/index.php/topic,5796.0.html (auto posting the form)
http://forum.pfsense.org/index.php/topic,5368.0.html (passing action & redirurl to custom .php page)

I'd still appreciate any corrections or suggestions.  Thanks!

index.html:

		Redirecting . . .

p.php:```

$message = ""; // set default error message to empty
$portal_redirurl = $_GET['portal_redirurl']; // get portal_redirurl from URL
$portal_action = $_GET['portal_action']; // get portal_action from URL

// if form submitted, validate

if ($_POST['submitted'] == 1)
{
$email = $_POST['email']; // get submitted e-mail address
$pattern = '/.@...*/'; // used to "validate" submitted e-mail address

	// if valid, process and auto-submit portal form
	if (preg_match($pattern, $_POST['email']) > 0)
	{
		// use e-mail here . . .

		// build auto-submitting for to allow user thru captive portal
		echo "

		";
		exit; // prevents latter code from displaying

}
// if email is invalid, set error message to be displayed
        $message = "E-mail address must be valid!

";
}
?>

ACCEPTABLE USE POLICY

	<iframe src="captiveportal-aup.html" style="width:90%;height:65%;margin-bottom:20px;"></iframe>
	$message";?>

<form method="post" action="<?echo $_SERVER['PHP_SELF'] . " ?portal_action=" . $portal_action . " &portal_redirurl=" . $portal_redirurl;?>">
Please enter your e-mail address:

By clicking 'Continue' you agree to the Acceptable Use Policy.

	</form>