(PHP 5 >= 5.2.0, PHP 7, PECL swoole >= 1.9.0)
swoole_async_readfile — Read a file asynchronously
filename
The filename of the file being read.
callback
filename
The name of the file.
content
The content readed from the file.
成功时返回 TRUE
, 或者在失败时返回 FALSE
。