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<?php

/**

* Sort multi-dimensional arrays by custom keys. Just for two-dimensional now.

* @param $list

* @param $rules <p>

* Custom sort rules. an multi-dimensional array with three elements each.

* first is the key to sort with,

* second is SORT_ASC or SORT_DESC,

* third one is SORT_REGULAR, SORT_NUMERIC or SORT_STRING.

* </p>

* @return bool

* @example:

* $list = [['a' => 1, 'b' => 2], ['a' => 1, 'b' => 3]];

* $rules = [['a', SORT_ASC, SORT_STRING], ['b', SORT_DESC, SORT_STRING]];

* multiKeySort($list, $rules);

*/

function multiKeySort(array &$list, array $rules) {

if (!$list || !$rules) {

return false;

}

$arr = [];

foreach ($rules as $rule) {

array_push($arr, array_column($list, $rule[0]), $rule[1], $rule[2]);

}

$arr[] = &$list;

call_user_func_array('array_multisort', $arr);

return true;

}

?>