(PECL swoole >= 1.9.0)
Swoole\Client::send — Send data to the remote TCP socket.
$flag= ?): int
The data to send which can be string or binary
If the client sends data successfully, it returns the length of data sent. Or it returns false and sets $swoole_client->errCode. For sync client, there is no limit for the data to send. For async client, The limit for the data to send is socket_buffer_size.