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getprotobynumber — Gets the protocol name for a protocol number.


mixed getprotobynumber(port_number);
int port_number: Port number


Name of the protocol; FALSE on error


getprotobynumber() gets the protocol name for the given protocol number on the local system. If the protocol number is not recognized, the function returns FALSE. If you're looking for port-to-service mapping (that is, port 80 is HTTP), see getservbyport() .

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+

See also



Example 839. Find which protocols are assigned to the first 255 available protocol numbers

$format = "%6s %s\n";
printf ($format, 'Number', 'Protocol');
printf ($format, '------', '--------');

for ($number = 0; $number < 255; $number++) {
   if (getprotobynumber ($number))
      printf ($format, " $number", getprotobynumber ($number));

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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