Neos\Neos\Domain\Service\SiteService::pruneAll PHP Method

    public function pruneAll()
    {
        foreach ($this->siteRepository->findAll() as $site) {
            $this->pruneSite($site);
        }
    }

 /**
  * Remove all content and related data - for now. In the future we need some more sophisticated cleanup.
  *
  * @param string $siteNode Name of a site root node to clear only content of this site.
  * @param string $siteNodeName This option is deprecated, use --site-node instead
  * @return void
  */
 public function pruneCommand($siteNode = null, $siteNodeName = null)
 {
     if ($siteNode !== null) {
         $siteNodeName = $siteNode;
     }
     if ($siteNodeName !== null) {
         $possibleSite = $this->siteRepository->findOneByNodeName($siteNodeName);
         if ($possibleSite === null) {
             $this->outputLine('The given site site node did not match an existing site.');
             $this->quit(1);
         }
         $this->siteService->pruneSite($possibleSite);
         $this->outputLine('Site with root "' . $siteNodeName . '" has been removed.');
     } else {
         $this->siteService->pruneAll();
         $this->outputLine('All sites and content have been removed.');
     }
 }