TYPO3 / TYPO3.CMS

        // Input data grabbed:

        $inData = GeneralUtility::_GP('tx_impexp');

        if ($inData === null) {

            // This happens if the post request was larger than allowed on the server

            // We set the import action as default and output a user information

            $inData = [

                'action' => 'import',

            ];

            $flashMessage = GeneralUtility::makeInstance(

                FlashMessage::class,

                $this->getLanguageService()->getLL('importdata_upload_nodata'),

                $this->getLanguageService()->getLL('importdata_upload_error'),

                FlashMessage::ERROR

            );

            $flashMessageService = GeneralUtility::makeInstance(FlashMessageService::class);

            $defaultFlashMessageQueue = $flashMessageService->getMessageQueueByIdentifier();

            $defaultFlashMessageQueue->enqueue($flashMessage);

        }

        if (!array_key_exists('excludeDisabled', $inData)) {

            // flag doesn't exist initially; state is on by default

            $inData['excludeDisabled'] = 1;

					' . $out . '

				</table>

			</div>';

        } else {

            /** @var $flashMessage FlashMessage */

            $flashMessage = GeneralUtility::makeInstance(FlashMessage::class, $this->getLanguageService()->getLL('storageNotBrowsableMessage'), $this->getLanguageService()->getLL('storageNotBrowsableTitle'), FlashMessage::INFO);

            /** @var $flashMessageService \TYPO3\CMS\Core\Messaging\FlashMessageService */

            $flashMessageService = GeneralUtility::makeInstance(FlashMessageService::class);

            /** @var $defaultFlashMessageQueue \TYPO3\CMS\Core\Messaging\FlashMessageQueue */

            $defaultFlashMessageQueue = $flashMessageService->getMessageQueueByIdentifier();

            $defaultFlashMessageQueue->enqueue($flashMessage);

            $out = '';

        }

        return $out;

    }