php对数组进行排序

<?php
// $order排序方式 desc或者asc
// $arr数组 
// $attr 排序值 应该为数组中键值对的键
function phpArrayOrderBy($arr, $attr, $order){
	$sortedItems = [];
	foreach ($arr as $item) {
		$key = is_object($item) ? $item->{$attr} : $item[$attr];
		$sortedItems[$key] = $item;
	}
	if ($order === 'desc') {
		krsort($sortedItems);
	} else {
		ksort($sortedItems);
	}
	return array_values($sortedItems);
}

<?php
  $arr = [['id' => 1, 'age' => 40],['id' => 2, 'age' => 39],['id' => 3, 'age' => 28]];
  print_r(phpArrayOrderBy($arr,'age','desc'));