can't distinguishing connection's close code

[AI-LIFENG]

Hello, folks! I'm facing an issue while using cboden/ratchet v0.4.4.

I'm having trouble distinguishing between

var conn = new WebSocket('ws://localhost:8088');
conn.close(4100, 'Abnormal closure')

and

conn.close(3100, 'whatelse') 

within the onClose(ConnectionInterface $conn) method.

Thanks

[AI-LIFENG]

I checked the source code at GitHub link. I want to access this $code variable.