Twig string render and Symfony extensions

Question

I'm using twig in my Symfony2 project to render templates form variable:

$env = new \Twig_Environment(new \Twig_Loader_String());
$render = $env->render(
    $renderString,
    $params
);

But when I trying to use Symfony twig functions(such as 'path', 'url', 'asset', 'controller', etc) it throws exception "The function "path" does not exist in...". There is the way to inject this function to the Twig_Environment?

Answer 1

This method works without cloning the twig environment: (Tested in symfony 3)

$rendered = $this->get('twig')
    ->createTemplate('Hi {{ name }}!')
    ->render(['name' => 'simon']);

Symfony extensions like path work, like requested.

Answer 2

Try this :

$twig = clone $this->get('twig');
$twig->setLoader(new \Twig_Loader_String());
$rendered = $twig->render(
    "Test string template: {{ result|humanize }}",
    array("result" => "mega_success")
);

cf. How to render a string as a Twig template in Symfony2