尝试使用symfony上传文件

use Symfony\Component\Form\Extension\Core\Type\FileType;
use Symfony\Component\Form\Extension\Core\Type\SubmitType;
use Symfony\Component\HttpFoundation\Request;

// ...

public function uploadFile(Request $request)
{
    $form = $this->createFormBuilder()
        ->add('file', FileType::class)
        ->add('submit', SubmitType::class, ['label' => 'Upload'])
        ->getForm();

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        $file = $form->get('file')->getData();

        // 处理上传的文件，例如保存到服务器或进行其他操作
        // ...

        return $this->redirectToRoute('upload_success');
    }

    return $this->render('upload.html.twig', [
        'form' => $form->createView(),
    ]);
}

{{ form_start(form) }}
{{ form_widget(form.file) }}
{{ form_widget(form.submit) }}
{{ form_end(form) }}

upload_file:
    path: /upload
    controller: App\Controller\YourController::uploadFile