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().
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