Read a file asynchronously

# swoole_async_readfile

(PECL swoole >= 1.9.0)

swoole_async_readfile — Read a file asynchronously

### 说明

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

### 参数

`filename`

  The filename of the file being read.

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

    The name of the file.

  `content`

    The content read from the file.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

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