PHP/Date/getservbyname

getservbyname.php

   <source lang="html4strict">

<?php

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

?>

 </source>
   
  

Using getservbyname()

   <source lang="html4strict">

<?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";
   }

?>

 </source>