[SOLVED]vb4 phrases in custom php. how to?

[nirvana43]

Hello
I have created 1 phrase with following settings :

Product : testAbc
Varname : testXxx
Text : This is a test message.


Now, when i try to access above phrase in my php file with following syntax, it doesn't give me any output (blank) :

PHP Code:

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

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

define('THIS_SCRIPT', 'test');
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('custom_test',
);

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

// ######################### REQUIRE BACK-END ############################
require_once('./global.php');
vB_Template::preRegister('custom_test', array('contents' => $contents));
// #######################################################################
// ######################## START MAIN SCRIPT ############################
// #######################################################################

$navbits = construct_navbits(array('' => 'Test'));
$navbar = render_navbar_template($navbits);
$aa=$vbphrase['testXxx'];
// ###### YOUR CUSTOM CODE GOES HERE #####
$pagetitle = 'This is a test page';

// ###### NOW YOUR TEMPLATE IS BEING RENDERED ######
//vB_Template::preRegister('header',array('contents' => $contents));
$templater = vB_Template::create('custom_test');
$templater->register_page_templates();
$templater->register('navbar', $navbar);
$templater->register('pagetitle', $pagetitle);
print_output($templater->render());
?>

When i directly write following in my custom_test template, it does give me output.

PHP Code:

{vb:phrase testXxx} 


or

PHP Code:

{vb:rawphrase testXxx} 


Somebody please help me.
How do i access phrase text in php file?