getprotobyname

(PHP 4, PHP 5, PHP 7, PHP 8)

getprotobyname — Get protocol number associated with protocol name

Description

getprotobyname(string $protocol): int |false

getprotobyname() returns the protocol number associated with the protocol protocol as per /etc/protocols.

Parameters

protocol: The protocol name.

Return Values

Returns the protocol number, or false on failure.

Examples

Example #1 getprotobyname() example

<?php
$protocol = 'tcp';
$get_prot = getprotobyname($protocol);
if ($get_prot === FALSE) {
 echo 'Invalid Protocol';
} else {
 echo 'Protocol #' . $get_prot;
}
?>

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User Contributed Notes 1 note

down

Vipindas K.S ¶

17 years ago

getprotobyname()
=====================

getprotobyname() gives the protocol number for the given protocol name on the local system.
If the protocol is not recognized, then the function returns -1.
The given code snippet gives the list of protocols along with their protocol numbers
<?
$arr=array("ip","icmp","ggp","tcp",
"egp","pup","udp","hmp","xns-idp",
"rdp","rvd" );
//Reads the names of protocols into an array..
for($i=0;$i<11;$i++)
{
$proname=$arr[$i];
echo $proname .":", getprotobyname ($proname)."<br />";
}

?>