include('myfile') in a class

[Anon]

I have made a class and I want to set some global variables for my database so I can do this:
<?php
class impl{

function dbcon(){
$con=mysql_connect$db.":".$port,$user,$pw); }

}

How can I set my variables $db, $port,$user and $pw without filling in the strings(for example $user="name"), but for example with an include file.

thanx

[Anon]

include("globals.php"); // but the vars here

class impl() {
function dbcon() {
global $db, $port, $user, $pw;
$con = ...;
}
}

Diego