Handlebars context helper concept

init.php

<?php
include 'vendor/autoload.php';

use Handlebars\Handlebars;
use Handlebars\Helpers;
use Handlebars\Loader\FilesystemLoader;

$helpers = new Helpers();

$helpers->add('data', function($template, $context, $args, $source) {
	$context->push(['injected' => 'this var was injected']);	
	$buffer = $template->render($context);
	$context->pop();
	return $buffer;
});


$engine = new Handlebars(array(
	'loader' => new FilesystemLoader(__DIR__),
	'helpers' => $helpers
));


echo $engine->render('template', ['parent' => 'this is a parent var!']);

render.html

<div>
	this var was injected
	this is a parent var!
</div>

this is a parent var!

template.handlebars

<div>
{{#data /totally/arbitrary/argument}}
	{{injected}}
	{{../parent}}
{{/data}}
</div>

{{parent}}