Untitled

<?php

    /* Darts scorekeeper v1.0
    Tue Feb 7 2012, KnickLighter */

    // Configuration
    $ds_game = "501";

    session_start();

    if ($_GET['act'] == "start") {
        $_SESSION['active'] = "yes";
        $_SESSION['score'] = $ds_game;
        $_SESSION['avg'] = "0";
        $_SESSION['throws'] = "0";
        $_SESSION['scored'] = array();
    }

    function ds_restart () { header("Location: index.php?act=start"); }
    function ds_error ($ds_err) {
        echo "<h1>Error!</h1><p>".$ds_err."</p><p>Click <a href=\"index.php\">here</a> to go back!";
        die();
    }

    if ($_GET['act'] == "throw") {
        if (isset($_GET['score'])) {
            $ds_score = htmlspecialchars($_GET['score']);
            if (!is_numeric($ds_score)) { ds_error("Score not numeric!"); }
            if ($ds_score == $_SESSION['score'] - 1) { ds_error("Score too high!"); }
            if ($ds_score > "180") { ds_error("Did you really score 180+?"); }
            if ($ds_score == $_SESSION['score']) { ds_restart(); }
            $_SESSION['score'] = $_SESSION['score'] - $ds_score;
            array_push($_SESSION['scored'], $ds_score);
            $_SESSION['throws'] = $_SESSION['throws'] + 1;
            $_SESSION['avg'] = ($ds_game - $_SESSION['score']) / ($_SESSION['throws']);
        }
    }
?>

<html>
<head>
<title>Darts</title>
</head>
<body onload="document.score.score.focus();">
<table width="100%">
<tr>
<td align="left"><a href="index.php?act=start">Start</a> |</td>
<td align="right">Darts thrown: <? echo $_SESSION['throws'] * 3 ." (".round($_SESSION['avg'], 2)." avg.)"; ?></td>
<tr>
</table>
<hr>
<h1><? echo $_SESSION['score']; ?></h1>
<hr>
<form name="score" method="GET">
<input type="hidden" name="act" value="throw">
<input type="text" name="score" autocomplete="off">
<input type="submit" value="Throw!">
</form>
<hr>
<?php

    $ds_amount = count($_SESSION['scored']);

    for ($i = $ds_amount; $i >= 0; $i--) {
        echo $_SESSION['scored'][$i] ."\n<br>";
    }

?>
</body>
</html>