Formatting numbers with sprintf

TDavid — Thu, 05 Apr 2007 00:43:54 +0000

In the game Keno you might have noticed that games begin at 001 and iterate to 999. Let’s look at some code to cycle properly and stay formatted in three digits using sprintf().

$game_number = 1;
echo ‘Game #’ . sprintf(“%03d”,$game_number); // Game #00x

Now let’s add some style magic to give the output a blackground with red numbers:

$game_number = 1;
echo ‘New game #’ . sprintf(“%03d”,$game_number) . ‘
’;

Finally we need to create some program logic to test when to reset the game number to 1. An IF statement will suffice and we’ll also add some code to go to show the next game number.

$game_number = (int)$_GET[‘gid’];
if($game_number > 999 or $game_number < 1) {
$game_number = 1;
}
echo ‘New game #’ . sprintf(“%03d”,$game_number) . ‘
’;
$game_number++;
echo “

\”?gid=$game_number\”>next game

”;

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Formatting numbers with sprintf