<?phpnamespace Welp\IcalBundle;use Welp\IcalBundle\DependencyInjection\WelpIcalExtension;use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;use Symfony\Component\HttpKernel\Bundle\Bundle;class WelpIcalBundle extends Bundle{ /** * Get container extension * * @return ExtensionInterface */ public function getContainerExtension() { if (!$this->extension instanceof ExtensionInterface) { $this->extension = new WelpIcalExtension(); } return $this->extension; }}