code: public function get($id)
      {
          $entry = null;
  
          $this->has($id) && $entry = $this->resolve($id);
  
          if (is_null($entry) === true) {
              $message = 'Alias (%s) is not being managed by the container';
  
              $message = (string) sprintf($message, $id);
  
              throw new Exception\NotFoundException($message);
          }
  
          return $entry;
      }
docs: Finds an entry of the container by its identifier and returns it.
  
  @throws \Psr\Container\NotFoundExceptionInterface
  @throws \Psr\Container\ContainerExceptionInterface
  
  @param  string $id
  @return mixed