# 使用POST表單上傳文件 Files that are uploaded using forms in POST requests can be retrieved with the Request method`getUploadedFiles()`. > 在POST請求中使用表單上傳的文件可以使用請求方法“getuploadedfiles()”檢索。 > When uploading files using a POST request, make sure your file upload form has the attribute`enctype="multipart/form-data"`otherwise`getUploadedFiles()`will return an empty array. > 當使用POST請求上傳文件時，請確保您的文件上傳表單具有屬性`enctype="multipart/form-data" ' otherwise ' getuploadedfiles()`將返回一個空數組。 If multiple files are uploaded for the same input name, add brackets after the input name in the HTML, otherwise only one uploaded file will be returned for the input name by`getUploadedFiles()`. > 如果為相同的輸入名上傳了多個文件，則在HTML中的輸入名之后添加括號，否則`getuploadedfiles()`將只返回一個上傳的文件作為輸入名。 Below is an example HTML form that contains both single and multiple file uploads. > 下面是一個包含單個和多個文件上傳的HTML表單示例。 ~~~php <!-- make sure the attribute enctype is set to multipart/form-data --> <form method="post" enctype="multipart/form-data"> <!-- upload of a single file --> <p> <label>Add file (single): </label><br/> <input type="file" name="example1"/> </p> <!-- multiple input fields for the same input name, use brackets --> <p> <label>Add files (up to 2): </label><br/> <input type="file" name="example2[]"/><br/> <input type="file" name="example2[]"/> </p> <!-- one file input field that allows multiple files to be uploaded, use brackets --> <p> <label>Add files (multiple): </label><br/> <input type="file" name="example3[]" multiple="multiple"/> </p> <p> <input type="submit"/> </p> </form> ~~~ Figure 1: Example HTML form for file uploads > 圖1:文件上傳的HTML表單示例 > 上傳的文件可以移動到一個目錄使用`moveTo`'的方法。下面是處理上述HTML表單上傳文件的示例應用程序。 > Uploaded files can be moved to a directory using the`moveTo`method. Below is an example application that handles the uploaded files of the HTML form above. ~~~php <?php use DI\Container; use Psr\Http\Message\ServerRequestInterface; use Psr\Http\Message\ResponseInterface; use Slim\Factory\AppFactory; require __DIR__ . '/../vendor/autoload.php'; $container = new Container(); $container->set('upload_directory', __DIR__ . '/uploads'); AppFactory::setContainer($container); $app = AppFactory::create(); $app->post('/', function(Request $request, Response $response) { $directory = $this->get('upload_directory'); $uploadedFiles = $request->getUploadedFiles(); // handle single input with single file upload $uploadedFile = $uploadedFiles['example1']; if ($uploadedFile->getError() === UPLOAD_ERR_OK) { $filename = moveUploadedFile($directory, $uploadedFile); $response->write('uploaded ' . $filename . '<br/>'); } // handle multiple inputs with the same key foreach ($uploadedFiles['example2'] as $uploadedFile) { if ($uploadedFile->getError() === UPLOAD_ERR_OK) { $filename = moveUploadedFile($directory, $uploadedFile); $response->write('uploaded ' . $filename . '<br/>'); } } // handle single input with multiple file uploads foreach ($uploadedFiles['example3'] as $uploadedFile) { if ($uploadedFile->getError() === UPLOAD_ERR_OK) { $filename = moveUploadedFile($directory, $uploadedFile); $response->write('uploaded ' . $filename . '<br/>'); } } return $response; }); /** * Moves the uploaded file to the upload directory and assigns it a unique name * to avoid overwriting an existing uploaded file. * * @param string $directory directory to which the file is moved * @param UploadedFileInterface $uploaded file uploaded file to move * @return string filename of moved file */ function moveUploadedFile($directory, UploadedFileInterface $uploadedFile) { $extension = pathinfo($uploadedFile->getClientFilename(), PATHINFO_EXTENSION); $basename = bin2hex(random_bytes(8)); // see http://php.net/manual/en/function.random-bytes.php $filename = sprintf('%s.%0.8s', $basename, $extension); $uploadedFile->moveTo($directory . DIRECTORY_SEPARATOR . $filename); return $filename; } $app->run(); ~~~ > 圖2:處理上傳文件的瘦應用程序示例 > Figure 2: Example Slim application to handle the uploaded files