从Rackspace容器调整图像大小，将图像保存在内存中作为容器中的新图像？

Question

我有一个脚本将图像文件上传到rackspace容器，之后我想要发生

1. 创建该图像文件的副本。
2. 将文件放入内存并调整图像大小。
3. 使用新文件名将文件上传到rackspace容器。

麻烦是我不确定如何将重新采样的图像放入内存并上传到rackspace容器。这是代码。

            $objectStoreService = $client->objectStoreService(null, 'IAD');
            $container = $objectStoreService->getContainer(IMAGE_CONTAINER_NAME);
            $fileData = fopen($_FILES['file-0']['tmp_name'], 'r');
            $uniqid = uniqid();
            $new_file_path = $uniqid."/".$_FILES['file-0']['name'];
            $sm_file_path = $uniqid . "/" . 'sm_' .$_FILES['file-0']['name'];
            // Upload filepath to database
            $user->upload_profile_pic($new_file_path, $sm_file_path);
            $result = $container->uploadObject($new_file_path, $fileData);
            $new_file_path = IMAGE_CONTAINER_LINK."/".$new_file_path;

            // Make Thumbnail of original image
            $percent = 0.5; // percentage of resize

            // Image to be changed.
            $original_image = imagecreatefromjpeg($new_file_path);
            list($width, $height) = getimagesize($new_file_path);

            $new_width = $width * $percent;
            $new_height = $height * $percent;

            //  Temporary blank image in memory of height/width
            $tmp_image = imagecreatetruecolor($new_width, $new_height);

            // Copies the source image and copies into it the blank image and resamples it.
            imagecopyresampled($tmp_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);


            // Save the image in memory
            imagejpeg($tmp_image, NULL, 100);

            // read the file
            // Not sure how to put image in memory to rackspace cloud.
            $fileData = fopen($tmp_image, 'r');
            $tmp_image = imagecreatefromstring(file_get_contents($new_file_path));
            $fileData = fopen($tmp_image, 'r');
            $result = $container->uploadObject($sm_file_path, $fileData);
            $response = array('image_path' => $new_file_path);
            header('HTTP/1.1 201 Created');
            echo json_encode($response);