Question

我不是英语本地人，并且在stackoverflow上是新的，所以如果我做了一些事情，请纠正我。我的问题是我从两个不同的mysql数据库名表中检索数据。

事件

消息

用于获取数据的代码如下。

$msgres=$ticket->getMessages();
$arr1 = array();
while($msg_row_one = db_fetch_array($msgres)){
    $arr1[] = $msg_row_one;
}
$noteres=$ticket->getNotes();
$arr2 = array();
while ($msg_row_two = db_fetch_array($noteres)){
    $arr2[] = $msg_row_two;
}

在此过程之后，我正在合并两个数组。

$ ARR1 []

$ ARR2 []

像这样。

$merge = array_merge($arr1,$arr2);

然后我得到如下数组。

Array
(
    [0] => Array
        (
            [msg_id] => 7563
            [ticket_id] => 1768
            [messageId] => 
            [msg_type] => R
            [message] => this is a link system . this is a link system .
            [staff_id] => 1
            [staff_name] => System Administrator
            [headers] => 
            [source] => staff
            [ip_address] => 10.12.145.174
            [created] => 2016-09-27 01:49:27
            [attachments] => 0
        )

    [1] => Array
        (
            [msg_id] => 7562
            [ticket_id] => 1768
            [messageId] => 
            [msg_type] => R
            [message] => Last message is this.
            [staff_id] => 1
            [staff_name] => System Administrator
            [headers] => 
            [source] => staff
            [ip_address] => 10.12.145.174
            [created] => 2016-09-26 08:39:46
            [attachments] => 0
        )

    [2] => Array
        (
            [msg_id] => 7561
            [ticket_id] => 1768
            [messageId] => 
            [msg_type] => R
            [message] => Last message is this.
            [staff_id] => 1
            [staff_name] => System Administrator
            [headers] => 
            [source] => staff
            [ip_address] => 10.12.145.174
            [created] => 2016-09-26 08:37:25
            [attachments] => 0
        )

    [3] => Array
        (
            [msg_id] => 7558
            [ticket_id] => 1768
            [messageId] => 
            [msg_type] => R
            [message] => mmmmmmmmmmmmmmmmmmmmmmmmmmm
            [staff_id] => 1
            [staff_name] => System Administrator
            [headers] => 
            [source] => staff
            [ip_address] => 10.12.145.174
            [created] => 2016-09-26 07:47:51
            [attachments] => 0
        )
  )

然后我通过以下代码按降序排序$merge数组的日期。

$strdate  = array();
$formated = array();
foreach ($merge as $ascdate){
    $strdate[] = strtotime($ascdate['created']);
}
rsort($strdate);
foreach($strdate as $descdate){
    $formated[] = date('Y-m-d H:i:s',$descdate);
}

现在我想代表日期以降序对整个$merge数组进行排序。意味着最大的日期$merge数组应该排在最前面。我不知道如何在$formated数组中应用以上排序日期$merge。

Answer 1

这样做，这是你在寻找合并两个数组之后，它使用数组多重排序 -

function array_orderby()
{
    $args = func_get_args();
    $data = array_shift($args);
    foreach ($args as $n => $field) {
        if (is_string($field)) {
            $tmp = array();
            foreach ($data as $key => $row)
                $tmp[$key] = $row[$field];
                $args[$n] = $tmp;
            }
    }
    $args[] = &$data;
    call_user_func_array('array_multisort', $args);
    return array_pop($args);
}

$arr = array(
        array('msg_id'=>123,'ticket_id'=>'32424','date'=>1233455,'created' => '2016-09-26 07:47:51'),
        array('msg_id'=>143,'ticket_id'=>'sssds','date'=>44724,'created' => '2016-09-27 07:47:51'),
        array('msg_id'=>13,'ticket_id'=>'3xxxx','date'=>434442424,'created' => '2016-10-26 07:47:51'),
        array('msg_id'=>723,'ticket_id'=>'eeeeeee','date'=>9908,'created' => '2016-06-06 17:47:51'),
        array('msg_id'=>793,'ticket_id'=>'fffff','date'=>9908,'created' => '2016-06-06 17:47:56')
    );
echo "Before Sorting";
print_r($arr);
$arr = array_orderby($arr, 'created', SORT_DESC) ;
echo "After sorting";
print_r($arr);

只需运行此示例即可获得所需内容

Answer 2

使用usort对整个数组进行排序，而不仅仅是提取日期

first

Answer 3

您可以为此

使用多重排序API

参考：示例＃3对数据库结果进行排序

http://php.net/manual/en/function.array-multisort.php

<?php
$aMultiSort = array();
$aTimeStamp  = array();
foreach ($merge as $key=>$ascdate){
    //create strtotime for numerical sorting
    $ascdate['timestamp'] = strtotime($ascdate['created']);
    $aMultiSort[$key] = $ascdate;
    $aTimeStamp[$key] = $ascdate['timestamp'];
}

//multi sort with timestamp desc
array_multisort($aTimeStamp, SORT_DESC, $aMultiSort);

Answer 4

在这种情况下，我可能会创建一个新方法，我称之为getAllComments()（或类似的东西）。在这个方法中，我可能会使用JOIN或UNION查询，同时从两个表/行（？）中选择所有信息。在此查询中，按日期排序非常简单，特别是如果它是JOIN查询。

如果是UNION查询，您可以将其包装在外部SELECT中，以便对数据进行排序。像这样：

SELECT * FROM (
    SELECT id, text, date FROM messages
    UNION SELECT id, text, date FROM notes
) ORDER BY date

无需涉及（相对）昂贵的PHP排序，也无需编写和测试代码所涉及的所有额外工作。毕竟，SQL引擎专门用于这些操作。：）

如何在php的日期列的基础上按降序对mysql结果数组进行排序？

4 个答案: