排序多维数组的最有效方法（php）

Question

I am looking for the most efficient way to sort a multidimensional array in php.I want to sort the array by the value name in [result][index][kl][0]. What is the fastest way to do this? My array has like 100 elements. My array looks like this:

Array
(
[jsonrpc] => 2.0
[id] => req-002
[result] => Array
    (
        [0] => Array
            (
                [type] => subst
                [lsid] => 11
                [date] => 20150209
                [startTime] => 955
                [endTime] => 1040
                [kl] => Array
                    (
                        [0] => Array
                            (
                                [id] => 29
                                [name] => S12UB
                            )

                    )

            )

        [1] => Array
            (
                [type] => subst
                [lsid] => 11
                [date] => 20150209
                [startTime] => 1045
                [endTime] => 1130
                [kl] => Array
                    (
                        [0] => Array
                            (
                                [id] => 29
                                [name] => S12UB
                            )

                    )

            )

Thank you.

Answer 1

Use a user-defined sort function, like usort along with strcmp:

function compareByName($a, $b) {
    // the strcmp returns a numeric value above or below 0 depending on the comparison
    return strcmp($a['k1'][0]['name'], $b['k1'][0]['name']);
}

Then, assuming your multi-dimensional array is named $array, replace the multi-dimensional array $array['result'] with the newly sorted array:

$array['result'] = usort($array['result'], 'compareByName');

The documentation for the usort and strcmp should be self-explanatory for understanding how the code works above.