order by serialized meta value

Thanks for the reply.

I tried it but it’s not working but I think there something missing or wrong in my code.

Let use the code from the link i gave.
This is the meta value
a:6:{s:5:"width";s:3:"580";s:6:"price";s:3:"99"

So the code is

global $query_string;
parse_str( $query_string, $my_query );
$my_query['meta_query'] = array(
    array(
         'key' => 'price',
         'value' => 0,
         'type' => 'SIGNED',
         'compare' => '>=',
    )
);
$my_query['orderby'] = '3';
$my_query['order'] = 'ASC';
query_posts( $my_query );

Actually I’m sure if the code below is right.

$my_query['orderby'] = '3';