I’m using Chosen Multiple Select on my search form.
Example :

What is the best practice to send & get query string with multiple select on my search form?
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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:
Given result if you selected the ids 2, 10 and 37.