Still, I give you some weird example 
/**
* Display the info
*
* @return string
*/
public function info()
{
ob_start();
phpinfo();
$phpinfo = ob_get_clean();
$phpinfo = str_replace('img {float: right; border: 0;}', '', $phpinfo);
$phpinfo = str_replace('a:link {color: #009; text-decoration: none; background-color: #fff;}', '', $phpinfo);
return $this->view->render($this->response, $this->templateDir . '/info.twig', ['phpinfo' => $phpinfo]);
}
My twig (the usefull part)
{% set title = 'Info' %}
{% extends common ~ 'layoutmain.twig' %}
{% block content %}
{{ phpinfo | raw }}
{% endblock %}