PHP Functions Essential Reference

getprotobyname

int getprotobyname( string protocol_name) 

Gets the standard protocol number for a protocol name.

Returns:

Port number; -1 on error

Description:

getprotobyname() gets the protocol number for the given protocol name on the local system. If the protocol is not recognized, the function returns -1. If you’re looking for service-to-port mapping (in other words, SMTP is port 25), see getservbyname().

Information on the protocol names and corresponding numbers can be found in RFC 1340 and your system’s /etc/protocol or c:\windows\protocol file (if present).

Availability:

UNIX, Windows

Version:

4.0b4+

See also:

getprotobynumber() 

Example:

23.9. Find out what number the UDP protocol is assigned

$protocol = 'udp'; echo "The $protocol ...