getservbyname() returns the Internet port which corresponds to service for the specified protocol as per /etc/services. protocol is either "tcp" or "udp" (in lowercase).
<?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";
}
?>For complete list of port numbers see: http://www.iana.org/assignments/port-numbers.
See also: getservbyport().
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