PHP | getprotobynumber() Function

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The getprotobynumber() function is an inbuilt function in PHP which returns the protocol name for a specified protocol number.

Syntax:

string getprotobynumber( int $protocol_number )

Parameters: This function accepts single parameter $protocol_number which is required. It specifies the protocol number, like 6 for tcp, 17 for udp etc.

Return Value: This function returns protocol name on success and FALSE on failure.

Note: This function is available for PHP 4.0.0 and newer version.

Below programs illustrate the getprotobynumber() function in PHP:

Program 1: This program uses protocol number for protocol name “tcp”.

<?php 
  
// The getprotobynumber() function get protocol 
// name associated with protocol number  
$protocolname = getprotobynumber(6); 
  
// Display result 
echo $protocolname; 
?> 

Output:

tcp

Program 2: This program checking for many protocol name.

<?php 
  
// Store the protocol number in an array 
$protocol_number  = array(6, 17, 20, 41); 
  
foreach( $protocol_number as $number ){ 
      
    // The getprotobynumber() function get protocol 
    // name associated with protocol number  
    echo $number . ": " . getprotobynumber($number) 
            . "<br>"; 
} 
?> 

Output:

6: tcp
17: udp
20: hmp
41: ipv6

Reference: https://www.php.net/manual/en/function.getprotobynumber.php

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