I don't get it yet...

Its like this -> I some kind of game using bitcoins, but how do i know if the player has payd let's say 0.0001BTC, Player doesn't do LOGIN, just select diff and play, BUT to been able to play, he need to pay a  low amout of 0.0001BTC....

How do i know (my system, PHP only..) if he has payed...

Thx4All till now!


Some thing that i see on here -> https://en.bitcoin.it/wiki/Proper_Money_Handling_(JSON-RPC)

Oh and one more thing..
 not right..assume this ->

$RoundValue = 0.12345678;
echo 'BTC 0,12345678 = "' .round($RoundValue * 1e8).'"';

?>

THIS WILL TURNS OUT TO BE

 
BTC 0,12345678 = "12345678"
That just not right!
and without that " round($RoundValue * 1e8)  " Its goes all FINE, the way is mean to be...or i forgetting something really bad ..?

So..What the hell?