在创建的Twig_Environment中渲染dump（）

Question

I try use debug extension in new Twig_Environment here is example

$twig = new \Twig_Environment(new \Twig_Loader_String());
$twig->addExtension( new \Twig_Extension_Debug());
$rendered = $twig->render(
"out : {{ dump(array) }}",
array("array" => ['aa','bb'])
);

die($rendered);

give my out:

why dump() not work ?

Answer 1

ok i found

$twig = new \Twig_Environment(new \Twig_Loader_String(),array(
            'debug' => true,
        ));