symfony - What to use instead of Twig_Loader_String

Question

I see that the Twig_Loader_String class has been deprecated and will be removed in Twig 2.0. Also, the comments in the source indicate that it should "NEVER be used".

There are numerous valid use cases for a string containing a Twig template.

The question is: What to use instead?

Answer 1

Twig_Environment#createTemplate should be used, as indicated in the issue deprecating Twig_Loader_String:

// the loader is not important, you can even just
// use the twig service in Symfony here
$twig = new Twig_Environment(...);

$template = $twig->createTemplate('Hello {{ name }}!');
echo $template->render(['name' => 'Bob']);

This code is the most simple way and bypasses the complete caching system. This means that it doesn't have the bad things of Twig_Loader_String (it doesn't create a new cache entry each time you call render; it doesn't have problems with referencing other templates; etc.), but it still isn't as quick as using Twig_Loader_Array (as shown by @AlainTiemblo's answer) or Twig_Loader_Filesystem.