Many variables. I want one array. How?

Hello. My problem is that i am creating a form from a .php page and that page can have from 1 to many rows. In each row there is a checkbox named "cbX", where X is the number of the row. I want the .php called from the previous submit to have access to the cbX variables in an array (so i can work with it into a for loop). JavaScript does it automagically if I give the checkbox the same name (say just "cb"), but in php I don't know how. Any suggestion, clues, alternatives are gracefully accepted. Thanks. Marko.