$orderby = $_POST['orderby'];
$sql = "SELECT * FROM produkter ORDER BY $orderby";
mysql_query($sql, $con);
<form action=listeprodukter.php method=POST>
<select name="orderby">
<option value="id">ID</option>
<option value="name">Navn</option>
<option value="price">Pris</option>
</select><br />
<input type="submite" name="submite" value="Velg" />
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