Include and extending classes

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I'm trying to consolidate code in a new project. My dirs are:
/
/inc
    core.class.php
/mods
/mods/system
    system.class.php //extends core.class.php
    user.class.php //extends system.class.php

In core.class.php I have my generic special html methods and my db
connection. I'm having trouble accessing $this->db (initialized in
core.class.php) from user.class.php. Am I wrong in thinking
user.class.php should be able to access methods/attributes of
core.class.php?
I'm running PHP 5.0.4 on Windows

//core.class.php

class core {

    var $db;

    function core(){
    //initialize db connection (works from here)
    }
//Other methods
}

//system.class.php
include "../../inc/core.class.php";
class system extends core {

    function system(){

    }
}

//user.class.php
include "system.class.php";
class user extends system{

    function user(){
    //$this->db cannot be used here
    }
}

TIA,
Mike
"There are no stupid questions." --my professors until I came into class.

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