(PECL swoole >= 1.9.0)
swoole_async_write — Write data to a file stream asynchronously
$filename,$content,$offset = ?,$callback = ?
filenameThe filename being written.
contentThe content writing to the file.
offsetThe offset.
callback
成功時(shí)返回 true， 或者在失敗時(shí)返回 false。