可以通过使用array_reduce()函数对具有多个键的多维数组进行分组。以下是将php数组按两个字段分组的示例代码：

$myArray = array(
    array('name' => 'John', 'age'=>25, 'gender' => 'Male'),
    array('name' => 'Jane', 'age'=>25, 'gender' => 'Female'),
    array('name' => 'Dave', 'age'=>30, 'gender' => 'Male'),
    array('name' => 'Maggie', 'age'=>30, 'gender' => 'Female'),
    array('name' => 'Michael', 'age'=>25, 'gender' => 'Male')
);

function groupByTwoFields($array, $key1, $key2) {
    return array_reduce($array, function($result, $item) use ($key1, $key2) {
        $result[$item[$key1]][$item[$key2]][] = $item;
        return $result;
    }, array());
}

$groupedArray = groupByTwoFields($myArray, 'age', 'gender');

print_r($groupedArray);

上述代码将按照“年龄”，“性别”两个字段对数组进行分组，输出结果如下：

Array
(
    [25] => Array
        (
            [Male] => Array
                (
                    [0] => Array
                        (
                            [name] => John
                            [age] => 25
                            [gender] => Male
                        )

                    [1] => Array
                        (
                            [name] => Michael
                            [age] => 25
                            [gender] => Male
                        )

                )

            [Female] => Array
                (
                    [0] => Array
                        (
                            [name] => Jane
                            [age] => 25
                            [gender] => Female
                        )

                )

        )

    [30] => Array
        (
            [Male] => Array
                (
                    [0] => Array
                        (
                            [name] => Dave
                            [age] => 30
                            [gender] => Male
                        )

                )

            [Female] => Array