private FormBase::container()
Returns the service container.
This method is marked private to prevent sub-classes from retrieving services from the container through it. Instead, \Drupal\Core\DependencyInjection\ContainerInjectionInterface should be used for injecting services.
\Symfony\Component\DependencyInjection\ContainerInterface $container The service container.
private function container() { return \Drupal::getContainer(); }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormBase.php/function/FormBase::container/8.1.x