getprotobynumber

(PHP 4, PHP 5)

getprotobynumber — プロトコル番号が指すプロトコル名を取得する

説明

string getprotobynumber ( int $number )

getprotobynumber() は、 /etc/protocols に基づきプロトコル番号 number が指すプロトコル名を返します。

パラメータ

number: プロトコル番号。

返り値

プロトコル名を文字列で返します。失敗した場合に FALSE を返します。

参考

getprotobyname() - プロトコル名のプロトコル番号を得る

add a note User Contributed Notes getprotobynumber

recycling dot sp dot am at gmail dot com 13-Sep-2010 05:40


Note that by the time of writing this note (5.3.3), there seems to be only two defined constants for the protocol numbers: SOL_UDP and SOL_TCP. 

For all other protocols (like ICMP,... ) you'll have to provide the exact number (EG: 1 for ICMP, ... )

<?php

    echo getprotobynumber(SOL_TCP) . "\n"; // prints tcp

    echo getprotobynumber(SOL_UDP) . "\n"; // prints udp

    var_dump(getprotobyname('tcp') == SOL_TCP); // bool(true)

    var_dump(getprotobyname('udp') == SOL_UDP); // bool(true)

?>

On a UNIX system (don't know if this is true for Windows), the php functions getprotobyname and getprotobynumber are just wrapper for their corresponding system calls. These functions returns the protocol name or protocol number based on the definition from IANA. If you are looking for a protocol and you don't know its number, you can find the exact protocol number here: http://www.iana.org/assignments/protocol-numbers

Vipindas K.S 08-May-2008 10:39


getprotobynumber()

=====================

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.The given code snippet gives the list of protocols along with their protocol numbers



<?

$format = "%6s %s\n<br />";

for ($number = 0; $number < 255; $number++)

 {

   if (getprotobynumber ($number))



      printf ($format, " $number-->", getprotobynumber ($number));

 }



?>



OUTPUT:



0--> ip 

1--> icmp 

3--> ggp 

6--> tcp 

8--> egp 

12--> pup 

17--> udp 

20--> hmp 

22--> xns-idp 

27--> rdp 

66--> rvd

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