Zend\Mvc\Application::init PHP Method

    public static function init($configuration = [])
    {
        // Prepare the service manager
        $smConfig = isset($configuration['service_manager']) ? $configuration['service_manager'] : [];
        $smConfig = new Service\ServiceManagerConfig($smConfig);
        $serviceManager = new ServiceManager();
        $smConfig->configureServiceManager($serviceManager);
        $serviceManager->setService('ApplicationConfig', $configuration);
        // Load modules
        $serviceManager->get('ModuleManager')->loadModules();
        // Prepare list of listeners to bootstrap
        $listenersFromAppConfig = isset($configuration['listeners']) ? $configuration['listeners'] : [];
        $config = $serviceManager->get('config');
        $listenersFromConfigService = isset($config['listeners']) ? $config['listeners'] : [];
        $listeners = array_unique(array_merge($listenersFromConfigService, $listenersFromAppConfig));
        return $serviceManager->get('Application')->bootstrap($listeners);
    }

 /**
  * Gets application commands
  *
  * @return array
  */
 protected function getApplicationCommands()
 {
     $setupCommands = [];
     $toolsCommands = [];
     $modulesCommands = [];
     $bootstrapParam = new ComplexParameter(self::INPUT_KEY_BOOTSTRAP);
     $params = $bootstrapParam->mergeFromArgv($_SERVER, $_SERVER);
     $params[Bootstrap::PARAM_REQUIRE_MAINTENANCE] = null;
     $bootstrap = Bootstrap::create(BP, $params);
     $objectManager = $bootstrap->getObjectManager();
     if (class_exists('Magento\\Setup\\Console\\CommandList')) {
         $serviceManager = \Zend\Mvc\Application::init(require BP . '/setup/config/application.config.php')->getServiceManager();
         $setupCommandList = new \Magento\Setup\Console\CommandList($serviceManager);
         $setupCommands = $setupCommandList->getCommands();
     }
     if (class_exists('Magento\\Tools\\Console\\CommandList')) {
         $toolsCommandList = new \Magento\Tools\Console\CommandList();
         $toolsCommands = $toolsCommandList->getCommands();
     }
     if ($objectManager->get('Magento\\Framework\\App\\DeploymentConfig')->isAvailable()) {
         $commandList = $objectManager->create('Magento\\Framework\\Console\\CommandList');
         $modulesCommands = $commandList->getCommands();
     }
     $commandsList = array_merge($setupCommands, $toolsCommands, $modulesCommands);
     return $commandsList;
 }