(PECL swoole >= 1.9.0)
swoole_async_read — Read file stream asynchronously
$filename,$callback,$chunk_size = 65536,$offset = 0
filenameThe filename of the file being read.
callbackfilenameThe name of the file.
contentThe content readed from the file stream.
chunk_sizeThe chunk length.
offsetThe offset.
Whether the read is succeed.