How to retrieve all Variables from a Twig Template?

Question

Is it possible to retrieve all variables inside a Twig template with PHP?

Example someTemplate.twig.php:

Hello {{ name }}, 
your new email is {{ ema         


        

Answer 1

$loader1 = new Twig_Loader_Array([
    'blub.html' => '{{ twig.template.code }}',
]);
$twig = new Twig_Environment($loader1);
$tokens = $twig->tokenize($loader1->getSource('blub.html'));
$nodes = $twig->getParser()->parse($tokens);

var_dump($this->getTwigVariableNames($nodes));


function getTwigVariableNames($nodes): array
{
    $variables = [];
    foreach ($nodes as $node) {
        if ($node instanceof \Twig_Node_Expression_Name) {
            $name = $node->getAttribute('name');
            $variables[$name] = $name;
        } elseif ($node instanceof \Twig_Node_Expression_Constant && $nodes instanceof \Twig_Node_Expression_GetAttr) {
            $value = $node->getAttribute('value');
            if (!empty($value) && is_string($value)) {
                $variables[$value] = $value;
            }
        } elseif ($node instanceof \Twig_Node_Expression_GetAttr) {
            $path = implode('.', $this->getTwigVariableNames($node));
            if (!empty($path)) {
                $variables[$path] = $path;
            }
        } elseif ($node instanceof \Twig_Node) {
            $variables += $this->getTwigVariableNames($node);
        }
    }
    return $variables;
}

have fun :-)