Neos\Neos\Controller\Module\Management\WorkspacesController::deleteAction PHP Method

    public function deleteAction(Workspace $workspace)
    {
        if ($workspace->isPersonalWorkspace()) {
            $this->redirect('index');
        }
        $dependentWorkspaces = $this->workspaceRepository->findByBaseWorkspace($workspace);
        if (count($dependentWorkspaces) > 0) {
            $dependentWorkspaceTitles = [];
            /** @var Workspace $dependentWorkspace */
            foreach ($dependentWorkspaces as $dependentWorkspace) {
                $dependentWorkspaceTitles[] = $dependentWorkspace->getTitle();
            }
            $message = $this->translator->translateById('workspaces.workspaceCannotBeDeletedBecauseOfDependencies', [$workspace->getTitle(), implode(', ', $dependentWorkspaceTitles)], null, null, 'Modules', 'Neos.Neos');
            $this->addFlashMessage($message, '', Message::SEVERITY_WARNING);
            $this->redirect('index');
        }
        $nodesCount = 0;
        try {
            $nodesCount = $this->publishingService->getUnpublishedNodesCount($workspace);
        } catch (\Exception $exception) {
            $message = $this->translator->translateById('workspaces.notDeletedErrorWhileFetchingUnpublishedNodes', [$workspace->getTitle()], null, null, 'Modules', 'Neos.Neos');
            $this->addFlashMessage($message, '', Message::SEVERITY_WARNING);
            $this->redirect('index');
        }
        if ($nodesCount > 0) {
            $message = $this->translator->translateById('workspaces.workspaceCannotBeDeletedBecauseOfUnpublishedNodes', [$workspace->getTitle(), $nodesCount], $nodesCount, null, 'Modules', 'Neos.Neos');
            $this->addFlashMessage($message, '', Message::SEVERITY_WARNING);
            $this->redirect('index');
        }
        $this->workspaceRepository->remove($workspace);
        $this->addFlashMessage($message = $this->translator->translateById('workspaces.workspaceHasBeenRemoved', [$workspace->getTitle()], null, null, 'Modules', 'Neos.Neos'));
        $this->redirect('index');
    }