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Well I’ve created this form but it aint updating the db. What am I doing wrong?

function update_portal($number_of_topics) {

global $bbdb, $bb_table_prefix;

$bbdb->query("UPDATE ".$bb_table_prefix."portal SET number_of_topics = '$number_of_topics'");

}

if ($_SERVER['REQUEST_METHOD'] == "POST")

{

update_portal($_POST['number_of_topics']);

}

// Show form

function portal_form() {

?>

<h2><?php _e('Management'); ?></h2>

<form action="" method="post">

<?php do_action('update_portal',''); ?>

<h3><?php _e('Portal settings'); ?></h3>

<table>

<tr><th scope="row"><?php _e('Number of topics on the portal:'); ?></th>

<td><input type="text" name="number_of_topics" id="number_of_topics" /></td>

</tr>

</table>

<p class="submit alignleft"><input type="submit" value="Submit" name="submit">

</form>

<?php

}

Thx