$file_info = $fdfs->storage_upload_by_callback($upload_callback_array, 'txt'); if ($file_info) { $group_name = $file_info['group_name']; $remote_filename = $file_info['filename']; var_dump($file_info); var_dump($fdfs->get_file_info($group_name, $remote_filename)); $download_callback_arg['filename'] = '/tmp/fdfs_out.txt'; $fdfs->storage_download_file_to_callback($group_name, $remote_filename, $download_callback_array); } else { echo "upload file fail, errno: " . $fdfs->get_last_error_no() . ", error info: " . $fdfs->get_last_error_info() . "\n"; } $file_id = $fdfs->storage_upload_by_callback1($upload_callback_array, 'txt'); if ($file_id) { var_dump($file_id); $download_callback_arg['filename'] = '/tmp/fdfs_out1.txt'; $fdfs->storage_download_file_to_callback1($file_id, $download_callback_array); } else { echo "upload file fail, errno: " . $fdfs->get_last_error_no() . ", error info: " . $fdfs->get_last_error_info() . "\n"; } function my_upload_file_callback($sock, $args) { var_dump($args); $ret = fastdfs_send_data($sock, $args['buff']); return $ret; } function my_download_file_callback($args, $file_size, $data) { var_dump($args); if ($args['fhandle'] == NULL) { $args['fhandle'] = fopen($args['filename'], 'w'); if (!$args['fhandle']) {