上傳文件並在Symfony2中移動後獲取文件擴展名

Question

我正在通過Symfony2上傳文件，並試圖重命名原始文件以避免覆蓋同一文件。這是我在做什麼：

$uploadedFile = $request->files; 
$uploadPath = $this->container->getParameter('kernel.root_dir') . '/../web/uploads/'; 

try { 
    $uploadedFile->get('avatar')->move($uploadPath, $uploadedFile->get('avatar')->getClientOriginalName()); 
} catch (\ Exception $e) { 
    // set error 'can not upload avatar file' 
} 

// this get right filename 
$avatarName = $uploadedFile->get('avatar')->getClientOriginalName(); 
// this get wrong extension meaning empty, why? 
$avatarExt = $uploadedFile->get('avatar')->getExtension(); 

$resource = fopen($uploadPath . $uploadedFile->get('avatar')->getClientOriginalName(), 'r'); 
unlink($uploadPath . $uploadedFile->get('avatar')->getClientOriginalName()); 

我重命名文件如下：

$avatarName = sptrinf("%s.%s", uniqid(), $uploadedFile->get('avatar')->getExtension()); 

但$uploadedFile->get('avatar')->getExtension()不給我上傳的文件的擴展名，所以我給像jdsfhnhjsdf.一個錯誤的文件名不帶擴展，爲什麼？在移動到結束路徑之前或之後重命名文件的正確方法是什麼？有什麼建議？

Answer 1

那麼，如果你知道它的解決方案非常簡單。

由於您move d UploadedFile，當前對象實例不能再使用。該文件不再存在，因此getExtension將返回null。新文件實例從move返回。

更改您的代碼（重構爲清楚起見）：

$uploadPath = $this->container->getParameter('kernel.root_dir') . '/../web/uploads/'; 

    try { 
     $uploadedAvatarFile = $request->files->get('avatar'); 

     /* @var $avatarFile \Symfony\Component\HttpFoundation\File\File */ 
     $avatarFile = $uploadedAvatarFile->move($uploadPath, $uploadedAvatarFile->getClientOriginalName()); 

     unset($uploadedAvatarFile); 
    } catch (\Exception $e) { 
     /* if you don't set $avatarFile to a default file here 
     * you cannot execute the next instruction. 
     */ 
    } 

    $avatarName = $avatarFile->getBasename(); 
    $avatarExt = $avatarFile->getExtension(); 

    $openFile = $avatarFile->openFile('r'); 
    while (! $openFile->eof()) { 
     $line = $openFile->fgets(); 
     // do something here... 
    } 
    // close the file 
    unset($openFile); 
    unlink($avatarFile->getRealPath()); 

（代碼沒有測試，只是寫的）希望它可以幫助！