mustache-lambda.php

<?php
require_once('Mustache.php'); // Ensure feature/higher-order-sections branch !!

class MyMustache extends Mustache {

	public function name()
	{
		return "Luke";
	}

	public function lambda($inner)
	{
		return '<strong>'.$this->render($inner).'</strong>';
	}

}

$m = new Mustache;
echo $m->render(
	"{{#lambda}}{{name}}{{/lambda}}",
	new MyMustache
);