Человеческий номер заказа - [VM2&3] Модификации и хаки

    	$db = JFactory::getDBO();
        $q = 'SELECT `order_number` 
        FROM #__virtuemart_orders 
        ORDER BY `order_number` DESC 
        LIMIT 1';
        $db->setQuery($q);
        $data = $db->loadAssoc();
        $a = (int)$data['order_number'] + 1;
        echo $a;
        return $a;

Warning: substr() expects parameter 3 to be long, string given in /administrator/components/com_virtuemart/models/orders.php on line 1128

public function generateOrderNumber($uid = 0,$length=10, $virtuemart_vendor_id=1)
{
$db = JFactory::getDBO();
$q = 'SELECT `virtuemart_order_id` FROM #__virtuemart_orders ORDER BY `virtuemart_order_id` DESC LIMIT 1';
$db->setQuery($q);
$data = $db->loadAssoc();
$order_id = ($data['virtuemart_order_id']+1).date("dmy");
return (int)$order_id;
}

СЧЕТ № <?php echo $InvId ?>

public function generateOrderNumber($uid = 0,$length=10, $virtuemart_vendor_id=1)
	{
		$db = JFactory::getDBO();
		$q = 'SELECT `virtuemart_order_id` FROM #__virtuemart_orders ORDER BY `virtuemart_order_id` DESC LIMIT 1';
		$db->setQuery($q);
		$data = $db->loadAssoc();
		$order_id = date('Ymd').($data['virtuemart_order_id']+1);
		return (int)$order_id;
	}

public function generateOrderNumber($uid = 0,$length=10, $virtuemart_vendor_id=1)
{
$db = JFactory::getDBO();
$q = 'SELECT `virtuemart_order_id` FROM #__virtuemart_orders ORDER BY `virtuemart_order_id` DESC LIMIT 1';
$db->setQuery($q);
$data = $db->loadAssoc();
$order_id = ($data['virtuemart_order_id']+1).date("dmy");
return (int)$order_id;
}

$_SESSION['mm_vm_order_id'] = $data;
return $data;

$db =& JFactory::getDBO();
$___id_order = mysql_fetch_assoc(mysql_query("SELECT `virtuemart_order_id` FROM `".$db->getPrefix()."virtuemart_orders` WHERE 
								`order_number` = '".$_SESSION['mm_vm_order_id']."' LIMIT 1;"));
echo 'Номер заказа: '.$___id_order['virtuemart_order_id'];

		static public function generateOrderNumber($uid = 0,$length=10, $virtuemart_vendor_id=1)
	{
    $db = JFactory::getDBO();
    $q = 'SELECT `virtuemart_order_id` FROM #__virtuemart_orders ORDER BY `virtuemart_order_id` DESC LIMIT 1';
    $db->setQuery($q);
    $data = $db->loadAssoc();
    $order_id = ($data['virtuemart_order_id']+1).date("dmy");
    return (int)$order_id;
	}