# swoole_async_readfile

(PHP 5 >= 5.2.0, PHP 7, PECL swoole >= 1.9.0)

swoole_async_readfile — Read a file asynchronously

### 说明

swoole_async_readfile ( string `$filename` , callable `$callback` ) : bool

### 参数

`filename`

  The filename of the file being read.

`callback`
  callback ( string `$filename` , string `$content` ) : mixed
  `filename`

    The name of the file.

  `content`

    The content readed from the file.

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。