I'm using Chosen
Multiple Select on my search form.
What is the best practice to send & get
query string with multiple select on my search form?
I'd imagine having the html as
<input type="hidden" name="chosen" value="<!-- id or whatever you want to work with-->" />
If you can have it through that Chosen thingie, that is.
Then you can simply get an array on serverside:
$arr = $_POST['chosen']; print_r($arr);
array(0 => 2, 1 => 10, 2 => 37)
Given result if you selected the ids 2, 10 and 37.