services.php

<?php

    use Phalcon\Mvc\Url as UrlResolver;
    use Phalcon\Db\Adapter\Pdo\Mysql as DbAdapter;
    use Phalcon\Mvc\Model\Metadata\Memory as MetaDataAdapter;
    use Phalcon\Session\Adapter\Files as SessionAdapter;

    $di = new Phalcon\DI\FactoryDefault;

    $di->set('config', $config);

    $di->set('view', function () use ($config) {

        $view = new Phalcon\Mvc\View;

        $view->setViewsDir($config->application->viewsDir);

        $view->registerEngines(array(
                '.volt' => function ($view, $di) use ($config) {

                    $volt = new Phalcon\Mvc\View\Engine\Volt($view, $di);

                    $volt->setOptions(array(
                        'compiledPath' => $config->application->cacheDir,
                        'compiledSeparator' => '_'
                    ));

                    return $volt;
                },
                '.phtml' => 'Phalcon\Mvc\View\Engine\Php'
            ));

            return $view;
    }, true);

    $di->set('router', function () {
        return require __DIR__ . '/routes.php';
    });
?>