#1: How can I get array variable from other page?
Well, the easiest way I can think of is to store it as a session variable. If you want to pass the array as a POST or GET value, you could serialize the array or implode it and explode it in the next page.
For the second question do you want a count on the form page (javascript or something?) or do you mean you would like to know how to show what you checked after submitting the form to another page?
