eZ\Publish\Core\Repository\ContentService::loadVersionInfoById PHP Method

    public function loadVersionInfoById($contentId, $versionNo = null)
    {
        if ($versionNo === null) {
            $versionNo = $this->loadContentInfo($contentId)->currentVersionNo;
        }
        try {
            $spiVersionInfo = $this->persistenceHandler->contentHandler()->loadVersionInfo($contentId, $versionNo);
        } catch (APINotFoundException $e) {
            throw new NotFoundException('VersionInfo', array('contentId' => $contentId, 'versionNo' => $versionNo), $e);
        }
        $versionInfo = $this->domainMapper->buildVersionInfoDomainObject($spiVersionInfo);
        if ($versionInfo->status === APIVersionInfo::STATUS_PUBLISHED) {
            $function = 'read';
        } else {
            $function = 'versionread';
        }
        if (!$this->repository->canUser('content', $function, $versionInfo)) {
            throw new UnauthorizedException('content', $function, array('contentId' => $contentId));
        }
        return $versionInfo;
    }