Subsequent fixes after major changes for PDO

vlandel.php

@@ -17,7 +17,7 @@ $sql = "SELECT vlan_id AS id, vlan_name AS name, vlan_number AS number
         FROM vlan
         WHERE vlan_id=?";
 $sth = $dbh->prepare($sql);
-$sth->execute([$zone_id]);
+$sth->execute([$vlan_id]);
 $smarty->assign("vlan", $sth->fetch(PDO::FETCH_OBJ));
 
 $smarty->display("vlandel.tpl");