Need a little help with scores

Hi there guys!

I could really use some help, hope one of you has got a minute :)

(I'm a designer, but total non-programmer making a fun game for my personal website)

What I've been struggling to do for the past few hours is add up everyone's scores in a flatfile using PHP. I just can't get the hang of it.

I wanna make a scores file starting at 0, and everytime someone plays my game and gets, say, 3000 points, I want to add that to the number already in the file. Then retrieve the sum and show it in the game.

Something like "1000000 points have been scored until now".

I just can't get the hang of it. Arrrgh so frustrating I can't do a simple addition because I know absolutely no PHP. Pretty please help me?

Excuse my English. I'm from Russia . <img src="smileys/smiley9.gif" border="0" align="middle" />

<?php

$file = "c:\users\user\scorefile.dat";

$score = $_GET['score'];

$total = file_get_contents($file);

$total += $score;

file_put_contents($file, $total);

?>

have to call page from your game somehow like this

mysite.com/score.php

but currently full of security holes e.g. anyone can post a score not just your game. May have to have game supply a secret key along with score

Thank you so very very much! It's all right, i'm sure my visitors aren't so interested in cheating at my game :)