PHP getservbyname() function usage and example

　 　 PHP HTTP 　reference manual

The getservbyname() function retrieves the port corresponding to the internet service protocol.

Syntax

int　getservbyname　(　string　$service　,　string　$protocol　)

Definition and usage

　getservbyname() returns the port corresponding to the internet service protocol specified by service, based on /etc/services.

Return value

　Returns the port number, if service or protocol is not found, returns FALSE.

Parameters

Example

Try the following example to get the port corresponding to the internet service protocol :

<?php
$services　=　array('http',　'ftp',　'ssh',　'telnet',　'imap','smtp',　'nicname',　'gopher',　'finger',　'pop3',　'www');
foreach　($services　as　$service)　{
　　　　$port　=　getservbyname($service,　'tcp');
　　　　echo　$service　.　":　"　.　$port　.　"<br　/>\n";
}
?>

PHP HTTP 　reference manual