Read file stream asynchronously.

# Swoole\Async::read

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

Swoole\Async::read — Read file stream asynchronously.

### 説明

public static Swoole\Async::read ( string `$filename` , callable `$callback` [, integer `$chunk_size` [, integer `$offset` ]] ) : bool

### パラメータ

`filename`

  The name of the file.

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

    The name of the file.

  `content`

    The content readed from the file stream.

`chunk_size`

  The chunk length.

`offset`

  The offset.

### 返り値

Whether the read is succeed.