PAMI\Message\IncomingMessage::getChannelVariables
Returns the channel variables for the given channel.
https://github.com/marcelog/PAMI/issues/85
Signature
public function getChannelVariables([string
        $channel = NULL] )
            
        Parameters
$channel— string- Channel name. If not given, will return variables
for the "current" channel. 
Returns
- array