So Ive got a pretty big array of data and need to sort them by two criteria.

There is variable $data['important'] and $data['basic'].

They are simple numbers and I am using uasort to sort $data firstly by important and then by basic.

So

Important | Basic
10        | 8
9         | 9
9         | 7
7         | 9

The usort function is a simple

public function sort_by_important($a, $b) {

        if ($a[important] > $b[important]) {
            return -1;
        } 
        elseif ($b[important] > $a[important]) {
            return 1;
        } 
        else {
            return 0;
        }
    }

How can I re-sort the array to the second variable and keep the Important ordering?

Thanks everyone.

EDIT

How about adding a third sorting option after this even? So Important > Basic > Less