the PHP maual says:
Note that you must not use indices with arrays in HTML! The array gets filled in the order the elements appear in the form. For functions you can use to process these arrays once you get them into your scripts, please see the Arrays section in the manual.
I have a form with checkboxes that returns an array will specified indicies. It is list of books that users can order:
<input type="checkbox" name="books_ordered[quick-easy]" value="QUICK AND EASY MEALS AND MENUS">
This seems to work fine, why does the manual recommend against this?