Swift_Transport_EsmtpTransport::getExtensionHandlers PHP Метод

    public function getExtensionHandlers()
    {
        return array_values($this->handlers);
    }

 public function __construct(\Swift_Transport_EsmtpTransport $transport, ConfigManager $config, ContainerInterface $container)
 {
     $mandrillApiKey = $config->get('atwix_mandrill.api_key');
     $mandrillApiUsername = $config->get('atwix_mandrill.api_username');
     if ($config->get('atwix_mandrill.enable_mandrill_integration') && !empty($mandrillApiKey) && !empty($mandrillApiUsername)) {
         $handlers = $transport->getExtensionHandlers();
         /** @var \Swift_Transport_Esmtp_AuthHandler $handler */
         $handler = reset($handlers);
         $transport->setHost($config->get('atwix_mandrill.smtp_host'));
         $transport->setPort($config->get('atwix_mandrill.smtp_port'));
         $handler->setPassword($mandrillApiKey);
         $handler->setUsername($mandrillApiUsername);
         \Swift_Mailer::__construct($transport);
     } else {
         $mailer = $container->get('mailer');
         parent::__construct($mailer, $container);
     }
 }