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PHP Getprotobyname () Function

Syntax:
int getprotobyname (string $name)
Parameters:This function takes one required parameter, $name . Specifies the name of the protocol, for example, tcp, icmp, udp, ip, etc.Return value:This function returns the protocol number on success and FALSE on error. Note.This function is available for PHP 4.0.0 and later.The following programs illustrate the getprotobyname() functionin PHP:Program 1:This program gets the protocol number for the protocol name "tcp".  
// Use getprotobyname() function for
// get protocol number $protocolnum = getprotobyname ( "tcp" );  
// Show result echo $protocolnum ;  
?>
Output:
6
Program 2:This program checks the name of many protocols. $protocols = array ( "tcp" , "udp" , " hmp " , " ipv6 " ); foreach ( $protocols as $protocol ) { // Use getprotobyname() function for // get protocol number $protocol_name = getprotobyname ( $protocol ); // Show result echo $protocol_name . ":" . $protocol . "
"
; }
?>
Output:
6: tcp 17: udp 20: hmp 41: ipv6
Link: https://www.php.net/manual/en/function.getprotobyname.php

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