PHP Tutorial to create your own Myspace

I read a tutorial on how to create your own Myspace script using PHP located here:

http://www.upgradetheweb.com/2007/0...cecom-with-phppart-ii-designing-the-database/

Being a php beginner, i'm wondering if someone can tell me what each line of the following php code means:

The database class

// Class: DbConnector
///////////////////////////////////////////////////////////////////////////////////////
require_once 'DbVars.php';
class DbConnector extends Dbvars {
var $theQuery;


function DbConnector(){
// Load settings from parent class
$settings = Dbvars::getSettings();
// Get the main settings from the array we just loaded
$this->host = $settings['dbhost'];

// Connect to the database
$this->link = mysql_connect($this->host, $this->user, $this->pass)or die(mysql_error());


function query($query) {
$this->theQuery = $query

function getSettings() {
// Database variables change accordingly
$settings['dbhost'] = 'localhost'

 

The first line, require_once includes the other php file. This is for including varibles or functions from that file.

The next line creates a new PHP class called DbConnection

Where there is function ... this create a new PHP function that can be then used in other files.