Using 2 different techniques (ASC & DESC) is not impossible, but its going to take a lot of tihinking
for example
page.php?order=name&method=asc
page.php?order=phone&method=asc
page.php?order=postal&method=asc
say, i have above 3 links.so, for sorting you already got it and ASC is the default. now, if you want to do desc too, then when you choose the order you also need to change the
method to DESC for next time.
PHP Code:
switch($_GET['order'])
{
case name:
$order = 'name';
$method = ($_GET['method'] == 'ASC')?'DESC:'ASC';
}
$query = "select * from table order by $order $method";
So, for next time now you have to change THAT PARTICULAR link to DESC, so when next time you click it, it also orders but this time it orders by DESC
i know its not clear. but, i couldn't find an example to support it