Notice: the documentation is suitable for PHP extension
swooleuntil v4.7.1, we only support PHP extension
<?php Swoole\Client->sendfile(string $filename, $offset = 0, $length = -1)
The location of the file to send.
Offset and start point to send the file.
The length of the data to send.
Send file to the remote socket.
This is a wrapper of the Linux sendfile system call.