Virtual Page Within Theme Template - wordpress

Question

I am creating a plugin that needs a virtual page in order to dynamically create a "Review Order" page (Orders are a custom post type I created). I was able to create a virtual page using the following code:
// Set up the rewrite rules for the order page
add_action( 'init', 'action_init_redirect' );
function action_init_redirect() {
add_rewrite_rule( 'orders/?', 'index.php?orders=new', 'top' );
}
add_filter( 'query_vars', 'filter_query_vars' );
function filter_query_vars( $query_vars ) {
$query_vars[] = 'orders';
return $query_vars;
}
add_action( 'parse_request', 'action_parse_request');
function action_parse_request( &$wp ) {
if ( array_key_exists( 'orders', $wp->query_vars ) ) {
//Beginning of page code
echo "hello";
exit;
}
}
The problem is that this creates a page with a blank template, that is, the above code creates a blank page with the text hello. I would like for the virtual page to be within the theme of the site and displayed like a regular page within the WordPress framework. How to accomplish this?

Answer 1

A solution is to add a template page inside parse_request:
function action_parse_request( $wp ) {
if ( array_key_exists( 'virtual', $wp->query_vars ) ) {
get_header(); ?>
<div id="primary">
<div id="content" role="main">
Hello, world!
</div>
</div>
<?php get_footer();
exit;
}
}

Answer 2

try using the following:
define('WP_USE_THEMES', true);
require('/ABSOLUTE_PATH_HERE/wp-blog-header.php');
require('/ABSOLUTE_PATH_HERE/wp-load.php');
you will need to add this to the top of your page.