Mardown syntax rendering helper for the Symfony framework

MardownHelper.php

<?php
require_once dirname(__FILE__).'/../vendor/php-markdown/markdown.php';

/**
 * Markdown Symfony Helper, require PHP Markdown library: http://michelf.com/projects/php-markdown/
 *
 * The idea is to parse and render text written using the Markdown format directly from your 
 * Symfony templates.
 *
 * Sample usage:
 *
 *     <?php set_markdown() ?>
 *     Heading
 *     =======
 *     
 *     Title 1
 *     -------
 *     
 *     Now let's there be [rock](http://en.wikipedia.org/wiki/Rock).
 *     <?php end_markdown() ?>
 * 
 * The fun is coming now, it's already i18n ready:
 *
 *     <?php set_markdown() ?>
 *     ### <?php echo __('This string will be first i18ned **then** markdown-parsed'); ?>
 *     <?php end_markdown() ?>
 *
 * Hint: Having the Mardown syntax rendered from the template on each request can be heavy; please
 * consider caching your templates.
 */ 

/**
 * Starts output buffering for Markdown content
 *
 */
function set_markdown() {
  ob_start();
  ob_implicit_flush(0);
}

/**
 * Renders buffered Markdown contents as HTML
 *
 * @return string
 */
function end_markdown()
{
  echo Markdown(ob_get_clean());
}