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 \"NEVE

Answer 1

$tplName = uniqid( 'string_template_', true );
$env = clone $this->getTwig();
$env->setCache(false);
$env->setLoader( new \Twig_Loader_Array( [ $tplName => 'Hello, {{ name }}' ] ));
$html = new Response( $env->render( $tplName, [ 'name' => 'Bob' ] ));

echo $html; // Hello, Bob

Answer 2

This actually seems to work as expected:

$tplName = uniqid( 'string_template_', true );
$env = clone $this->getTwig();
$env->setLoader( new \Twig_Loader_Array( [ $tplName => 'Hello, {{ name }}' ] ));
$html = new Response( $env->render( $tplName, [ 'name' => 'Bob' ] ));
$cacheName = $env->getCacheFilename( $tplName );
if( is_file( $cacheName ) )
{
  unlink( $cacheName );
}
echo $html; // Hello, Bob

I found the hints here: http://twig.sensiolabs.org/doc/recipes.html#using-different-template-sources.

Note that deleting the cache file would not be desirable if the template string came from a database or something similar. I use this functionality for rendering templates that are created dynamically and have very short life spans, usually when debugging and testing.

Answer 3

Try it

$template = $this->container->get('twig')->createTemplate('hello {{ name }}');
echo $template->render(array('name' => 'Fabien'));

Answer 4

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.

Answer 5

The best is: http://twig.sensiolabs.org/doc/2.x/recipes.html#loading-a-template-from-a-string

As example used by me:

public function parse($content, $maxLoops = 3, $context = array())
{
    if (strlen($content) < 1) {
        return null;
    }

    for ($i = 0; $i < $maxLoops; $i++) {
        $template = $this->container->get('twig')->createTemplate($content);
        $result = $template->render( $context );

        if ($result == $content) {
            break;
        } else {
            $content = $result;
        }
    }

    return $content;
}

Answer 6

$environment = new \Twig_Environment(new \Twig_Loader_Array(array()));
$template = $environment->createTemplate('{{ template }} {{ replacements }}');

echo $template->render([replacements]);