This function returns the port which corresponds to service for the
specified protocol as per /etc/services.
Parameter
string $service -
name of the service to check
string $protocol -
access protocol
Return value
integer -
port number of the service
Note
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().
