order by links

[diablo_programmer]

Hi, im doing a ORDER BY php tutorial. I've followed every step carefully but it still won't work. I've copied the code from the tutorial and replaced all necessary parts but still it wont work. Someone that could point out the error?

<?php
/* set the allowed order by columns */
$default_sort = 'id';
$allowed_order = array ('id', 'titel','genre', 'bolag');

/* if order is not set, or it is not in the allowed
 * list, then set it to a default value. Otherwise, 
 * set it to what was passed in. */
if (!isset ($_GET['order']) || 
    !in_array ($_GET['order'], $allowed_order)) {
    $order = $default_sort;
} else {
    $order = $_GET['order'];
}

/* connect to db */
mysql_connect ('xxxxxxx','xxxxxxxxx','xxxxxxx');
mysql_select_db ('xxxxxxxxx');

/* construct and run our query */
$query = "SELECT * FROM filmer ORDER BY $order";
$result = mysql_query ($query);

/* make sure data was retrieved */
$numrows = mysql_num_rows($result);
if ($numrows == 0) {
    echo "No data to display!";
    exit;
}

/* now grab the first row and start the table */
$row = mysql_fetch_assoc ($result);
echo "&lt;TABLE border=1&gt;\n";
echo "&lt;TR&gt;\n";
foreach ($row as $heading=&gt;$column) {
    /* check if the heading is in our allowed_order
     * array. If it is, hyperlink it so that we can
     * order by this column */
    echo "&lt;TD&gt;&lt;b&gt;";
    if (in_array ($heading, $allowed_order)) {
        echo "&lt;a href=\"{$_SERVER['PHP_SELF']}?order=$heading\"&gt;$heading&lt;/a&gt;";
    } else {
        echo $heading;
    }                
    echo "&lt;/b&gt;&lt;/TD&gt;\n";
}
echo "&lt;/TR&gt;\n";

/* reset the $result set back to the first row and 
 * display the data */
mysql_data_seek ($result, 0);
while ($row = mysql_fetch_assoc ($result)) {
    echo "&lt;TR&gt;\n";
    foreach ($row as $column) {
        echo "&lt;TD&gt;$column&lt;/TD&gt;\n";
    }
    echo "&lt;/TR&gt;\n";
}
echo "&lt;/TABLE&gt;\n";
?>