External PHP forms not posting properly, also question about structure

[razec]

Regarding my last thread (https://vborg.vbsupport.ru/showthread.php?t=231999)...

When I attempt to post the form that I created, vBulletin gives an error:

Your submission could not be processed because a security token was missing.

If this occurred unexpectedly, please inform the administrator and describe the action you performed before you received this error.

The form was just a simple test form that posts a hidden field and a text field. The form's script looks like this:

<?

	// ####################### SET PHP ENVIRONMENT ###########################
	error_reporting(E_ALL & ~E_NOTICE);

	// #################### DEFINE IMPORTANT CONSTANTS #######################

	define('THIS_SCRIPT', 'testform');
	define('CSRF_PROTECTION', true);  
	// change this depending on your filename

	// ################### PRE-CACHE TEMPLATES AND DATA ######################
	// get special phrase groups
	$phrasegroups = array();

	// get special data templates from the datastore
	$specialtemplates = array();

	// pre-cache templates used by all actions
	$globaltemplates = array('TESTFORM',
	);

	// pre-cache templates used by specific actions
	$actiontemplates = array();

	// ######################### REQUIRE BACK-END ############################
	// if your page is outside of your normal vb forums directory, you should change directories by uncommenting the next line
	// chdir ('/path/to/your/forums');
	require_once('./global.php');

	// #######################################################################
	// ######################## START MAIN SCRIPT ############################
	// #######################################################################

	$navbits = construct_navbits(array('' => 'Test Form'));
	$navbar = render_navbar_template($navbits);

	// ###### YOUR CUSTOM CODE GOES HERE #####
	$pagetitle = 'Test Form Submission';
	
	$poutput = '';
	
	if( $vbulletin->userinfo['userid'] == '' )
	{
		$poutput = '<p>You must be logged in to use this form.</p>';
	}
	else
	{
		$poutput = '
			<p>Hello, user #' . $vbulletin->userinfo['userid'] . '. Please fill out the form below.</p>
			
			<form action="testform_submit.php" method="post">
				<input type="hidden" name="t" value="1"/>
				
				<table border="0">
					<tr>
						<td align="right" valign="center"><b>Name:</b></td>
						<td valign="center"><input type="text" name="uname" size="30"/></td>
					</tr>
				</table><br/><br/>
				
				<input type="submit" name="submit" value="OK"/>
			</form>';
	}

	// ###### NOW YOUR TEMPLATE IS BEING RENDERED ######

	$templater = vB_Template::create('TESTFORM');
	$templater->register_page_templates();
	$templater->register('navbar', $navbar);
	$templater->register('pagetitle', $pagetitle);
	$templater->register('poutput', $poutput);
	print_output($templater->render());

?>

The target of the form:

<?

	/*
	 * Test Form - Submit Script
	 */
	 
	// ####################### SET PHP ENVIRONMENT ###########################
	error_reporting(E_ALL & ~E_NOTICE);

	// #################### DEFINE IMPORTANT CONSTANTS #######################

	define('THIS_SCRIPT', 'testformsubmit');
	define('CSRF_PROTECTION', true);  
	// change this depending on your filename

	// ################### PRE-CACHE TEMPLATES AND DATA ######################
	// get special phrase groups
	$phrasegroups = array();

	// get special data templates from the datastore
	$specialtemplates = array();

	// pre-cache templates used by all actions
	$globaltemplates = array('TESTFORMSUBMIT',
	);

	// pre-cache templates used by specific actions
	$actiontemplates = array();

	// ######################### REQUIRE BACK-END ############################
	// if your page is outside of your normal vb forums directory, you should change directories by uncommenting the next line
	// chdir ('/path/to/your/forums');
	require_once('./global.php');

	// #######################################################################
	// ######################## START MAIN SCRIPT ############################
	// #######################################################################

	$navbits = construct_navbits(array('' => 'Test Form Submit'));
	$navbar = render_navbar_template($navbits);

	// ###### YOUR CUSTOM CODE GOES HERE #####
	$pagetitle = 'Test Form Submission Script';
	
	$presult = '';
	if( $vbulletin->userinfo['userid'] == '' )
	{
		$presult = '<p>You must be logged in to process user forms.</p>';
	}
	else
	{
		if( $_POST['t'] != '1' )
		{
			$presult = '<p>This script cannot be run directly.</p>';
		}
		else if( $_POST['uname'] == '' )
		{
			$presult = '<p>You must enter your name.</p>';
		}
		else
		{
			$presult = '<p>Your name is ' . $_POST['uname'] . '.</p>';
		}
	}

	// ###### NOW YOUR TEMPLATE IS BEING RENDERED ######

	$templater = vB_Template::create('TESTFORMSUBMIT');
	$templater->register_page_templates();
	$templater->register('navbar', $navbar);
	$templater->register('pagetitle', $pagetitle);
	$templater->register('presult', $presult);
	print_output($templater->render());

?>

I did some browsing around and found a similar problem that someone experienced with VB3, so I added a line to my form: <input type="hidden" name="securitytoken" value="$bbuserinfo[securitytoken]" />

This had no effect, however. The problem persists. Viewing source on the form, there is no value set for the securitytoken field.

So, my two questions here:

1. How can I fix this error that I'm getting?
2. Is there a better way to check to see if the user is logged in (and ultimately, to check to see if the user is a member of a specific group) rather than me doing it like I am in the above examples? It'd obviously be more ideal if I could have the form itself in a template, rather than sending it to a template as a variable.