4. 编写程序，实现多文件上传。表单页面可以考虑用JQUERY实现不固定数量的文件上传框。文件名multiplefiles.html、upload.php。利用函数封装多文件上传操作，以实现函数的重复利用。（可以在网上搜索一下代码）

multiplefiles.html: ```html <!DOCTYPE html> <html> <head> <title>多文件上传</title> <script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js"></script> <script> $(function(){ $("#addFile").click(function(){ var fileInput = '<input type="file" name="file[]" /><br/>'; $("#fileContainer").append(fileInput); }); }); </script> </head> <body> <form action="upload.php" method="post" enctype="multipart/form-data"> <div id="fileContainer"> <input type="file" name="file[]" /><br/> </div> <input type="button" id="addFile" value="添加文件" /> <input type="submit" value="上传" /> </form> </body> </html> ``` upload.php: ```php <?php function uploadFiles($files, $uploadDir) { if(!file_exists($uploadDir)) { mkdir($uploadDir, 0777, true); } $uploadedFiles = array(); $errors = array(); foreach($files['name'] as $key => $name) { if($files['error'][$key] === UPLOAD_ERR_OK) { $tmpName = $files['tmp_name'][$key]; $ext = pathinfo($name, PATHINFO_EXTENSION); $newName = uniqid('file_').'.'.$ext; $dest = $uploadDir.'/'.$newName; if(move_uploaded_file($tmpName, $dest)) { $uploadedFiles[] = $newName; } else { $errors[] = '无法移动文件 '.$name.'.'; } } else { $errors[] = '上传文件 '.$name.' 出错：'.$files['error'][$key]; } } return array( 'uploadedFiles' => $uploadedFiles, 'errors' => $errors, ); } if(isset($_FILES['file'])) { $uploadDir = 'uploads'; $result = uploadFiles($_FILES['file'], $uploadDir); echo '<h2>上传结果</h2>'; if(!empty($result['uploadedFiles'])) { echo '<p>上传成功的文件：</p>'; echo '<ul>'; foreach($result['uploadedFiles'] as $file) { echo '<li>'.$file.'</li>'; } echo '</ul>'; } if(!empty($result['errors'])) { echo '<p>上传失败的文件：</p>'; echo '<ul>'; foreach($result['errors'] as $error) { echo '<li>'.$error.'</li>'; } echo '</ul>'; } } ?> ```

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