php man page for getservbyport

GETSERVBYPORT(3)							 1							  GETSERVBYPORT(3)

getservbyport - Get Internet service which corresponds to port and protocol

SYNOPSIS
       string getservbyport (int  $port, string  $protocol)

DESCRIPTION
       getservbyport(3) returns the Internet service associated with $port for the specified $protocol as per /etc/services.

PARAMETERS
	      o $port
		- The port number.

	      o $protocol
		-$protocol is either "tcp" or "udp" (in lowercase).

RETURN VALUES
	Returns the Internet service name as a string.

SEE ALSO
       getservbyname(3).

PHP Documentation Group 													  GETSERVBYPORT(3)