สอบถามเกี่ยวกับวิธีเขียน upload file ไปยัง domain อื่นหน่อยครับ

if (empty($_FILES['image']['name']) || !isset($_FILES['image']['error'])) {
    $_FILES['image']['error'] = 4;
}

if ($_POST && $_FILES) {
    $phpFileUploadErrors = array(
        0 => 'There is no error, the file uploaded with success',
        1 => 'The uploaded file exceeds the upload_max_filesize directive in php.ini',
        2 => 'The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form',
        3 => 'The uploaded file was only partially uploaded',
        4 => 'No file was uploaded',
        6 => 'Missing a temporary folder',
        7 => 'Failed to write file to disk.',
        8 => 'A PHP extension stopped the file upload.',
    );
    $uploadFolder = __DIR__ . DIRECTORY_SEPARATOR . 'uploaded';
    $allowedMimeTypes = ['image/jpeg', 'image/png', 'image/gif'];

    if (isset($_FILES['image']['error']) && $_FILES['image']['error'] !== UPLOAD_ERR_OK) {
        $output['error'] = true;
        $output['message'] = $phpFileUploadErrors[$_FILES['image']['error']];
    } else {
        if (!is_dir($uploadFolder)) {
            $oldumask = umask(0);
            mkdir($uploadFolder, 0777);
            umask($oldumask);
            unset($oldumask);
        }

        $moveToFileName = $uploadFolder . DIRECTORY_SEPARATOR . $_FILES['image']['name'];
        if (move_uploaded_file($_FILES['image']['tmp_name'], $moveToFileName)) {
            $Finfo = new finfo();
            $output['uploadedMimeType'] = $Finfo->file($moveToFileName, FILEINFO_MIME_TYPE);
            unset($Finfo);
            if (in_array(strtolower($output['uploadedMimeType']), $allowedMimeTypes)) {
                http_response_code(201);
                $output['uploadSuccess'] = true;
                $output['message'] = 'Uploaded completed.';
            } else {
                http_response_code(400);
                $output['uploadSuccess'] = false;
                $output['error'] = true;
                $output['message'] = 'You have uploaded disallowed file types.';

                @unlink($moveToFileName);
            }
        } else {
            $output['error'] = true;
            $output['message'] = 'Unable to move uploaded file.';
        }

        unset($moveToFileName);
    }

    unset($uploadFolder);