Мой массив выглядит так
Array ( [0] => Array ( [last_name] => Kournikova [first_name] => Anna [gender] => Female [date_of_birth] => 6/3/1975 [favorite_color] => Red ) [1] => Array ( [last_name] => Hingis [first_name] => Martina [gender] => Female [date_of_birth] => 4/2/1979 [favorite_color] => Green ) [2] => Array ( [last_name] => Seles [first_name] => Monica [gender] => Female [date_of_birth] => 12/2/1973 [favorite_color] => Black ) [3] => Array ( [last_name] => Abercrombie [first_name] => Neil [gender] => Male [date_of_birth] => 2/13/1943 [favorite_color] => Tan ) [4] => Array ( [last_name] => Bishop [first_name] => Timothy [gender] => Male [date_of_birth] => 4/23/1967 [favorite_color] => Yellow ) [5] => Array ( [last_name] => Kelly [first_name] => Sue [gender] => Female [date_of_birth] => 7/12/1959 [favorite_color] => Pink ) [6] => Array ( [last_name] => Smith [first_name] => Steve [gender] => Male [date_of_birth] => 3/3/1985 [favorite_color] => Red ) [7] => Array ( [last_name] => Bonk [first_name] => Radek [gender] => Male [date_of_birth] => 6/3/1975 [favorite_color] => Green ) [8] => Array ( [last_name] => Bouillon [first_name] => Francis [gender] => Male [date_of_birth] => 6/3/1975 [favorite_color] => Blue ) ) Результатом является
Kournikova Anna Female 6/3/1975 Red Hingis Martina Female 4/2/1979 Green Seles Monica Female 12/2/1973 Black Abercrombie Neil Male 2/13/1943 Tan Bishop Timothy Male 4/23/1967 Yellow Kelly Sue Female 7/12/1959 Pink Smith Steve Male 3/3/1985 Red Bonk Radek Male 6/3/1975 Green Bouillon Francis Male 6/3/1975 Blue
Я хочу, чтобы результат был Женщинами перед Самцами по last_name возрастанию
Hingis Martina Female 4/2/1979 Green Kelly Sue Female 7/12/1959 Pink Kournikova Anna Female 6/3/1975 Red Seles Monica Female 12/2/1973 Black Abercrombie Neil Male 2/13/1943 Tan Bishop Timothy Male 4/23/1967 Yellow Bonk Radek Male 6/3/1975 Green Bouillon Francis Male 6/3/1975 Blue Smith Steve Male 3/3/1985 Red
Как я могу применить usort() для сортировки по этому заказу?