php按某个值给二维数组倒序

$a = [
	['name' => 'zy1', 'amount' => 100],
	['name' => 'zy2', 'amount' => 500],
	['name' => 'zy3', 'amount' => 10],
	['name' => 'zy4', 'amount' => 90],
	['name' => 'zy5', 'amount' => 1001],
	['name' => 'zy6', 'amount' => 200]
];

array_multisort(array_column($a,'amount'), SORT_DESC,$a); //SORT_DESC降序，SORT_ASC升序

var_dump($a);