我嘗試使用音譯器來音譯照片名稱，但我不知道為什么我總是看到錯誤：嘗試從命名空間“App\Controller”調用函數“transliterator_transliterate”。這是一個代碼：<?phpnamespace App\Controller;use App\Entity\Photo;use App\Form\UploadPhotoType;use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;use Symfony\Component\HttpFoundation\File\UploadedFile;use Symfony\Component\HttpFoundation\Request;use Symfony\Component\Routing\Annotation\Route;class IndexController extends AbstractController{    /**    * @Route("/", name="index")     * @param Request $request     * @return \Symfony\Component\HttpFoundation\Response     */    public function index(Request $request)    {        $form = $this->createForm(UploadPhotoType::class);        $form->handleRequest($request);        if ($form->isSubmitted() && $form->isValid()) {            $em = $this->getDoctrine()->getManager();            if ($this->getUser()) {                /** @var UploadedFile $pictureFileName */                $pictureFileName = $form->get('filename')->getData();                if ($pictureFileName) {                    try {                        $originalFileName = pathinfo($pictureFileName->getClientOriginalName(), PATHINFO_FILENAME);                        $safeFileName = transliterator_transliterate('Any-Latin; Latin-ASCII; [^A-Za-z0-9_] remove; Lower()', $originalFileName);                        $newFileName = $safeFileName.'-'.uniqid().'.'.$pictureFileName->guessExtension();                        $pictureFileName->move('images/hosting', $newFileName);我不知道如何解決它。我現在正在學習一些課程，我復制了腳本以查看問題所在。copy之后還是不行