class Competitor
{
    public $CompetitorID;
...

//Removed the 'Javascript' as well as 'css' styles here bcs tht wont be needed...
//datas getting inserted fine on command line and on php-editor preview, but not on the localhost server.
//"Apache/2.0.54 (Win32) Server at localhost Port 80" this is the bottom line msg displayed on my browser.
...

<?php
function clean($string){ 
...

<?php
/**
 * Database: MySQL connection
...

<?php

public static function addUser($username, $email, $password)
...

<?php

if (!defined('ANTIHACK'))
...

<?php

abstract class mySQL // abstract => cannot be instanciated
...

function db_cache_2($query)
 {
  // Query cache table
...