virtualpage.php

function os_rewrite_rules(){

	$options = get_option( 'os_ub_settings', array( 'os_ub_text_slug' => 'company' ) );
	$slug = $options['os_ub_text_slug'];
	$cat_slug = $options['os_ub_cat_slug'];

	add_rewrite_rule('^'.$slug.'/add/?','index.php?page_id=os_ub_add_page','top');

	// dev
	// flush_rewrite_rules( true );
}
add_action( 'init', 'os_rewrite_rules', 0 );

add_filter('the_posts', 'os_endpoint_page' );
function os_endpoint_page($posts){
	global $wp,$wp_query;
	$page_slug = 'os_ub_add_page';

	//check if user is requesting our fake page
	// if( count($posts) == 0 && (strtolower($wp->request) == $page_slug || $wp->query_vars['page_id'] == $page_slug)){
	if( isset($wp->query_vars['page_id']) && $wp->query_vars['page_id'] == $page_slug ){

		$options = get_option( 'os_ub_settings', array( 'os_ub_text_slug' => 'company', 'os_ub_add_page_ID' => 6 ) );
		$slug = $options['os_ub_text_slug'];

		$add_page_ID = $options['os_ub_add_page_ID'];
		$page = get_post( $add_page_ID );

		//create a fake post
		$post = new stdClass;
		$post->post_author = $page->post_author;
		$post->post_name =  '/'.$slug.'/add/' ;
		// $post->post_name = $page_slug;
		$post->guid = site_url('/'.$slug.'/add/' );
		$post->post_title = $page->post_title;
		//put your custom content here
		$post->post_content = $page->post_content;
		$post->ID = $page->ID;
		// $post->post_status = $page->post_status;
		$post->post_status = 'static';
		$post->comment_status = $page->comment_status;
		$post->ping_status = $page->ping_status;
		$post->comment_count = $page->comment_count;
		// $post->post_date = current_time('mysql');
		$post->post_date = $page->post_date;
		$post->post_date_gmt = $page->post_date_gmt;

		$posts = NULL;
		$posts[] = $post;

		$wp_query->is_page = true;
		$wp_query->is_singular = true;
		$wp_query->is_home = false;
		$wp_query->is_archive = false;
		$wp_query->is_category = false;
		unset($wp_query->query["error"]);
		$wp_query->query_vars["error"]="";
		$wp_query->is_404 = false;
	}

	return $posts;
}