解决array_multisort关联索引不变，但数字键名会被重置问题

感谢作者的方法

转载连接：http://www.cnblogs.com/fengliang/p/6193234.html

$array = [
    "2" => [
        "title" => "Flower",
        "order" => 3
    ],
    "3" => [
        "title" => "Rock",
        "order" => 1
    ],
    "4" => [
        "title" => "Grass",
        "order" => 2
    ]
];

$keys = array_keys($array);
array_multisort(
    array_column($array, "order"), SORT_DESC, SORT_NUMERIC, $array, $keys
);
$array = array_combine($keys, $array);

print_r($array);