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可能重复:
如何在PHP中对数组和数据进行排序？
如何在
PHP中排序多维数组PHP排序数组按SubArray值PHP 按值
排序多维数组

我的数组看起来像:

Array(
    [0] => Array(
         [name] => Bill
         [age] => 15
    ),
    [1] => Array(
         [name] => Nina
         [age] => 21
    ),
    [2] => Array(
         [name] => Peter
         [age] => 17
    )
);

我想根据他们的名字按字母顺序对它们进行排序.我看到PHP排序数组按SubArray值,但它没有多大帮助.任何想法如何做到这一点？

我需要按照getNotifications函数中值'start_date'的DESC顺序对通知数组进行排序：

$posts_id_arr = getPoststIds($conn);

foreach ($posts_id_arr as $key => $val) {
  $total_arr[$key] = [
    'notification' => getNotifications($val['post_id'], $user_id, $conn)
  ];
}

$response_array = array('data' => $total_arr, 'more things' => $more_array);
echo json_encode($response_array);

现在，由于foreach循环，订单是通过邮递ID进行的。

data {
       notification: 
      [
       {
        post_id: “1",
        start_date: "2016-10-10 08:00:00",
       },
       {
        post_id: “1",
        start_date: "2016-10-10 12:00:00",
       }
    ],
     notification:
      [
        post_id: “2",
        start_date: "2016-10-10 09:00:00",
       },
       {
        post_id: “2",
        start_date: "2016-10-10 13:00:00",
       }
    ]
}

我需要是1：08:00，2：09:00，1：12:00，2：13:00