Array Sorting, 2 items...

Hi, Trying to accomplish: I want to sort my array by two columns. The array is setup: Array ( [0] => Array ( [0] => CHECKING [ba_type] => CHECKING [1] => 10132200 [loan_number] => 10132200 [2] => 10000049 [loan_id] => 10000049 [3] => MONICA [first_name] => MONICA [4] => MERCHANT [last_name] => MERCHANT [5] => 2003-07-17 16:15:32 [approved_date] => 2003-07-17 16:15:32 [6] => ACH Debit [type] => ACH Debit ) [1] => Array ( [0] => CHECKING [ba_type] => CHECKING [1] => 10154654 [loan_number] => 10154654 [2] => 10000055 [loan_id] => 10000055 [3] => RICH [first_name] => RICH [4] => LABO [last_name] => LABO [5] => 2003-07-17 16:15:32 [approved_date] => 2003-07-17 16:15:32 [6] => ACH Debit [type] => ACH Debit ) ) What I'd like to happen is first sort by ba_type, and then sort by loan_number, so that I end up with a nice output similar to; CHECKING 101234 CHECKING 101544 CHECKING 101573 SAVINGS 101112 SAVINGS 101224 VISA 101110 VISA 101998 Keep everything groupped together in their respective ba_type, and put the numbers in numeric order. I've looked at usort, and many examples of it. I can see how to use it to sort one column, but how would I sort a second to achieve this? -Dan Joseph