php 数组 按某个字段来排序

$a=Array ("0" => Array ("money" => "1397.98","months" => "06月25日" ),
"1" => Array ("money" => "2425.59","months" => "06月11日" ),
"2" => Array ("money" => "2345.55","months" => "06月20日" ));
$keys = array_column($a, 'months');
array_multisort($keys, SORT_ASC, $a);
echo"<pre>";
print_r($a);