PHP/Date/getservbyname

getservbyname.php

 
<?php
   echo "HTTP"s default port number is: ".getservbyname("http", "tcp"); 
?>

Using getservbyname()

 
<?php
    $service = "ftp";
    $port = getservbyname($service, "tcp");
    if($port === false) {
        die("Lookup of service "$service" failed.\n");
    } else {
        echo "Service "$service" runs on port $port\n";
    }
?>