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 protocol specified by the Internet service service, based on /etc/services.

Return value

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

Parameters

Example

Try the following examples 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