<?phpnamespace TMWK\GitBackupBundle;use Symfony\Component\HttpKernel\Bundle\Bundle;use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;use TMWK\GitBackupBundle\DependencyInjection\TMWKGitBackupExtension;class TMWKGitBackupBundle extends Bundle{ public function getContainerExtension(): ?ExtensionInterface { if (null === $this->extension) { $this->extension = new TMWKGitBackupExtension(); } return $this->extension; }}