yii\di\Container::setSingleton PHP Метод

    public function setSingleton($class, $definition = [], array $params = [])
    {
        $this->_definitions[$class] = $this->normalizeDefinition($class, $definition);
        $this->_params[$class] = $params;
        $this->_singletons[$class] = null;
        return $this;
    }

 /**
  * @return Container
  */
 private static function getIoc()
 {
     $diConfig = (include 'di.php');
     $container = new Container();
     $container->setSingleton('workerMapper', $diConfig['workerMapper']);
     $container->setSingleton('entityfx\\utils\\workers\\contracts\\repositories\\WorkerRepositoryInterface', function ($container, $params, $config) use($diConfig) {
         return $container->get($diConfig['workerRepository'], [$container->get('workerMapper')]);
     });
     $container->set('entityfx\\utils\\workers\\contracts\\WorkerInterceptorInterface', function ($container, $params, $config) use($diConfig) {
         return $container->get($diConfig['workerInterceptor'], [$params['worker'], $container->get('entityfx\\utils\\workers\\contracts\\repositories\\WorkerRepositoryInterface')]);
     });
     return $container;
 }