Voting

Hej Jeg får denne fejl:

Notice: Undefined index: is_posted in C:\wamp\www\picture voting\test.php on line 30 Call Stack: 0.0016 693744 1. {main}() C:\wamp\www\picture voting\test.php:0


Når jeg køre dette script:   

jeg har markeret line 30 med ()


<?php
$db = mysql_connect("localhost", "root");
mysql_select_db("voting", $db);

$votes_array = array("Jeg elsker den!", "Den er ok...", "Ved ikke", "Kan ikke lide den...");
?>

Hvad synes du om den nye F599 Fiorano?

<?php
$ip = $_SERVER['REMOTE_ADDR'];

$result = mysql_query("SELECT COUNT(*) FROM afstem WHERE ip = '".$ip."'") or die (mysql_error());
?>

<?php
(line 30) if (mysql_result($result, 0) == 0):
?>

    <?php
    if ($_POST['is_posted']):
        mysql_query("INSERT INTO afstem (vote, ip) VALUES ('".$_POST['vote']."', '".$ip."')") or die(mysql_error());
    endif;
    ?>

    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">

    <input type="hidden" name="is_posted" value="1">

    <?php
    for ($i=0; $i<count($votes_array); $i++):
        echo "<input name=vote type=radio value=".$i."> ".$votes_array[$i]."<br />";
    endfor;
    ?>

    <input type="submit" value="Stem">
    </form>

<?php
else:
?>

    <?php
    $result = mysql_query("SELECT COUNT(*) FROM afstem") or die(mysql_error());

    $total_votes = mysql_result($result, 0);
    ?>

    <?php
    $result = mysql_query("SELECT vote, COUNT(*) AS num_of_votes FROM afstem GROUP BY vote") or die(mysql_error());
 
    while ($data = mysql_fetch_array($result, MYSQL_ASSOC)):
        $vote = $data['vote'];

        $votes[$vote] = $data['num_of_votes'];
    endwhile;

    for ($i=0; $i<count($votes_array); $i++):
        echo $votes_array[$i].": ";

        if (isset($votes[$i])):
            echo "(".round($votes[$i] / $total_votes * 100)."%)";
        else:
            echo "(0%)";
        endif;

        echo "<br />";
    endfor;
    ?>

<?php
endif;
?>