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getprotobyname — Gets the standard protocol number for a protocol name.


int getprotobyname(protocol_name);
string protocol_name: Name of the protocol


Port number; -1 on error


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/protocolorc:\windows\protocol file (if present).


PHP Version: 4.0b4+


Example 838. Find out what number the UDP protocol is assigned

$protocol = 'udp';
echo "The $protocol protocol is number ", getprotobyname ($protocol);

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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