Code Help for Events

[Tequila]

I'm coding a few events (one is a continuous puzzle collecting event that updates once a month with a new puzzle) and want to have it set up so that once a user "finds" a piece it shows up on a new page (tentatively titled 'puzzle', it would show up as 'puzzle.php?user=$username') that's linked from their profile.

Once a puzzle is completed they should get an message from the system that congratulates them, and hands out a promo code for a limited edition adoptable (only two available per user).

Before I can get it ready I'll need to create the puzzle page that's linked, and a way to see what pieces users have in MySQL to check against my puzzle file (which you can see below).

How would I go about doing this? I'm a little lost on what I need to code.

(PS: My puzzle file which lists all parts of the puzzles)

PHP Code:

// **********************************************************************************
// Welcome to the puzzle piece randomizer
// This file will generate 15 pieces of puzzles based on the event and season names
// Pieces can be traded in our forums to complete puzzles at any time
// So far our pieces are
// world, dusk, dawn, eclipse, seasons (spring, summer, fall, winter)
// Let's get this finished up then
// **********************************************************************************

<?php

    $digits = array {
        "01.png",
        "02.png",
        "03.png",
        "04.png",
        "05.png",
        "06.png",
        "07.png",
        "08.png",
        "09.png",
        "10.png",
        "11.png",
        "12.png",
        "13.png",
        "14.png",
        "15.png",
    }

    $event = array {
        "world",
        "dusk",
        "dawn",
        "eclipse",
    }

    $season = array {
        "spring",
        "summer",
        "fall",
        "winter",
    }

?>