Twig Magic Attributes

index.php

<?php
// Setup Twig.
require_once 'vendor/autoload.php';
$loader = new Twig_Loader_String();
$twig_options = array(
  'cache' => FALSE,
  'autoescape' => TRUE,
  'strict_variables' => FALSE,
  'debug' => TRUE,
  'auto_reload' => TRUE,
);
$twig = new Twig_Environment($loader, $twig_options);
$twig->addExtension(new Twig_Extension_Debug());

// Mock classes.
class Comment {
  function getOwner() {
    return new Owner;
  }
}

class Owner {
  function isAnonymous() {
    return 'TRUE';
  }
}

// Variables passed into template.
$data = ['comment' => new Comment];

// Preferred
print $twig->render('<br>{{ comment.owner.anonymous }} ==  TRUE', $data);
print $twig->render('<br>{{ comment.getOwner.isAnonymous }} ==  TRUE', $data);
print $twig->render('<br>{{ comment.getOwner().isAnonymous() }} ==  TRUE', $data);
print $twig->render('<br>{{ comment.owner.isAnonymous() }} ==  TRUE', $data);
print $twig->render('<br>{{ comment.getOwner().isAnonymxous() }} == FALSE', $data);
print $twig->render('<br>{{ comment.isAnonymous() }} ==  FALSE', $data);