Twig_Environment::__construct PHP Method

    public function __construct(Twig_LoaderInterface $loader = null, $options = array())
    {
        if (null !== $loader) {
            $this->setLoader($loader);
        }

        $options = array_merge(array(
            'debug'               => false,
            'charset'             => 'UTF-8',
            'base_template_class' => 'Twig_Template',
            'strict_variables'    => false,
            'autoescape'          => true,
            'cache'               => false,
            'auto_reload'         => null,
            'optimizations'       => -1,
        ), $options);

        $this->debug              = (bool) $options['debug'];
        $this->charset            = $options['charset'];
        $this->baseTemplateClass  = $options['base_template_class'];
        $this->autoReload         = null === $options['auto_reload'] ? $this->debug : (bool) $options['auto_reload'];
        $this->extensions         = array(
            'core'      => new Twig_Extension_Core(),
            'escaper'   => new Twig_Extension_Escaper((bool) $options['autoescape']),
            'optimizer' => new Twig_Extension_Optimizer($options['optimizations']),
        );
        $this->strictVariables    = (bool) $options['strict_variables'];
        $this->runtimeInitialized = false;
        $this->setCache($options['cache']);
        $this->functionCallbacks = array();
        $this->filterCallbacks = array();
    }

 public function __construct(ContainerInterface $container, \Twig_LoaderInterface $loader = null, $options = array())
 {
     parent::__construct($loader, $options);
     foreach ($container->findAnnotatedServiceIds('twig.extension') as $id => $attributes) {
         $this->addExtension($container->get($id));
     }
 }