Question

我有以下数组：

$inboxMessages = array(
    105775 => array( //index is thread_id
        0 => array(
            'id' => 85,
            'thread_id' => 105775,
            'message' => "hello",
            'created_at' => "May 20, 2015",
            'datetime' => 1432118191,
            'sender_id' => 13,
        ),
        1 => array(
            'id' => 70,
            'thread_id' => 105775,
            'message' => "hii",
            'created_at' => "May 19, 2015",
            'datetime' => 1432021227,
            'sender_id' => 13,
        )
    ),
    224199 => array( //index is thread_id
        0 => array(
            'id' => 88,
            'thread_id' => 224199,
            'message' => "yessss...",
            'created_at' => "May 20, 2015",
            'datetime' => 1432306513,
            'sender_id' => 14,
        ),
        1 => array( //index is thread_id
            'id' => 75,
            'thread_id' => 224199,
            'message' => "hellowwww...",
            'created_at' => "May 19, 2015",
            'datetime' => 1432021227,
            'sender_id' => 14,
        )
    ),
    107917 => array( //index is thread_id
        0 => array(
            'id' => 56,
            'thread_id' => 107917,
            'message' => "how r u??",
            'created_at' => "May 16, 2015",
            'datetime' => 1431792155,
            'sender_id' => 14,
        ),
        1 => array(
            'id' => 30,
            'thread_id' => 107917,
            'message' => "hi.. i m fine.",
            'created_at' => "May 6, 2015",
            'datetime' => 1430920006,
            'sender_id' => 14,
        ),
        2 => array(
            'id' => 30,
            'thread_id' => 107917,
            'message' => "hi!!!!..how r u??",
            'created_at' => "May 6, 2015",
            'datetime' => 1430920006,
            'sender_id' => 14,
        )
    ),
    378552 => array( //index is thread_id
        0 => array(
            'id' => 108,
            'thread_id' => 378552,
            'message' => "hi",
            'created_at' => "May 29, 2015",
            'datetime' => 1432906923,
            'sender_id' => 14,
        ),
        1 => array(
            'id' => 107,
            'thread_id' => 378552,
            'message' => "hi.",
            'created_at' => "May 29, 2015",
            'datetime' => 1432903194,
            'sender_id' => 14,
        )
    )
);

所以我需要这样的输出：

$inboxMessages = array(
    378552 => array( //index is thread_id
        0 => array(
            'id' => 108,
            'thread_id' => 378552,
            'message' => "hi",
            'created_at' => "May 29, 2015",
            'datetime' => 1432906923,
            'sender_id' => 14,
        ),
        1 => array(
            'id' => 107,
            'thread_id' => 378552,
            'message' => "hi.",
            'created_at' => "May 29, 2015",
            'datetime' => 1432903194,
            'sender_id' => 14,
        )
    ),
    224199 => array( //index is thread_id
        0 => array(
            'id' => 88,
            'thread_id' => 224199,
            'message' => "yessss...",
            'created_at' => "May 20, 2015",
            'datetime' => 1432306513,
            'sender_id' => 14,
        ),
        1 => array( //index is thread_id
            'id' => 75,
            'thread_id' => 224199,
            'message' => "hellowwww...",
            'created_at' => "May 19, 2015",
            'datetime' => 1432021227,
            'sender_id' => 14,
        )
    ),
    105775 => array( //index is thread_id
        0 => array(
            'id' => 85,
            'thread_id' => 105775,
            'message' => "hello",
            'created_at' => "May 20, 2015",
            'datetime' => 1432118191,
            'sender_id' => 13,
        ),
        1 => array(
            'id' => 70,
            'thread_id' => 105775,
            'message' => "hii",
            'created_at' => "May 19, 2015",
            'datetime' => 1432021227,
            'sender_id' => 13,
        )
    ),
    107917 => array( //index is thread_id
        0 => array(
            'id' => 56,
            'thread_id' => 107917,
            'message' => "how r u??",
            'created_at' => "May 16, 2015",
            'datetime' => 1431792155,
            'sender_id' => 14,
        ),
        1 => array(
            'id' => 30,
            'thread_id' => 107917,
            'message' => "hi.. i m fine.",
            'created_at' => "May 6, 2015",
            'datetime' => 1430920006,
            'sender_id' => 14,
        ),
        2 => array(
            'id' => 30,
            'thread_id' => 107917,
            'message' => "hi!!!!..how r u??",
            'created_at' => "May 6, 2015",
            'datetime' => 1430920006,
            'sender_id' => 14,
        )
    ),

);

我希望按datetime的{{1}}子数组的值对主数组进行排序。

thread_id数组已经在排序。

所以我只想按thread_id的子数组排序主数组。

我需要最近的datetime在数组上排名第一

我到目前为止尝试了它对我有用：

thread_id

并尝试使用消息function comp($a, $b) { if ($a[0]->datetime == $b[0]->datetime) { return 0; } return $a[0]->datetime > $b[0]->datetime ? -1 : 1; } uasort($inboxMessages, "comp");：

id

Answer 1

使用uasort

function cmp($a, $b) {
    if ($a[0]['datetime'] == $b[0]['datetime']) {
        return 0;
    }
    return ($a[0]['datetime'] < $b[0]['datetime']) ? 1 : -1;
}
uasort($inboxMessages, "cmp");

根据PHP版本，您可以指定＆＃34; cmp＆＃34;作为匿名函数。另请注意，此方法依赖于每个线程中至少包含一条消息的事实。

Answer 2

您可以按如下方式使用uasort()来实现以下格式

function comp($a, $b) {
    if ($a[0]['datetime'] == $b[0]['datetime']) {
        return 0;
    } return $a[0]['datetime'] > $b[0]['datetime'] ? -1 : 1;
}
uasort($inboxMessages, "comp");

Check Demo

我想在php中排序3维数组

2 个答案: