integer Net_Portscan::getPort (
$protocol = 'tcp'
This function returns the port which corresponds to service for the specified protocol as per /etc/services.
string $service -
name of the service to check
string $protocol -
port number of the service
This function can be called statically.
The port number is retrieved from the machine where Net_Portscan is executed, not from the remote host, which you possibly used in Net_Portscan::checkPort().