PHP Functions Essential Reference

getservbyname

mixed getservbyname(string service_name, string protocol_type) 

service_name	Service name
protocol_type	Protocol name; either tcp or udp

Gets the port number for a service.

Returns:

Port number; FALSE on error

Description:

getservbyname() fetches the port number for the given service running under the given protocol, as defined in your system’s /etc/services or c:\windows\services file. If the protocol is not recognized, the function returns FALSE.

Availability:

UNIX, Windows

Version:

4.0b4+

See also:

getservbyport() 

Example:

23.11. Find the HTTP service’s default listening port

<?php $protocol = 'tcp'; $service = 'http'; echo "The $service service listens on port ", getservbyname($service, $protocol), ' by default.'; ?> ...