The getprotobyname() function is an inbuilt function in PHP which returns the protocol number for a specified protocol name.
Syntax:
int getprotobyname( string $name )
Parameters: This function accepts single parameter $name which is required. It specifies the protocol name, like tcp, icmp, udp, ip etc.
Return Value: This function returns the protocol number on success and FALSE on failure.
Note: This function is available for PHP 4.0.0 and newer version.
Below programs illustrate the getprotobyname() function in PHP:
Program 1: This program gets the protocol number for protocol name “tcp”.
<?php // Use getprotobyname() function to // get the protocol number $protocolnum = getprotobyname("tcp"); // Display the result echo $protocolnum; ?> |
Output:
6
Program 2: This program checking the many protocols name.
<?php $protocols = array("tcp", "udp", "hmp", "ipv6"); foreach( $protocols as $protocol ){ // Use getprotobyname() function to // get the protocol number $protocol_name = getprotobyname($protocol); // Display the result echo $protocol_name . ": " . $protocol . "<br>"; } ?> |
Output:
6: tcp 17: udp 20: hmp 41: ipv6
Reference: https://www.php.net/manual/en/function.getprotobyname.php
