(PHP 4, PHP 5)
getservbyport — Get Internet service which corresponds to port and protocol
$port
   , string $protocol
   )
   getservbyport() returns the Internet service
   associated with port for the specified
   protocol as per /etc/services.
  
portThe port number.
protocol
       protocol is either "tcp"
       or "udp" (in lowercase).
      
Returns the Internet service name as a string.