Question

我想在“日期”字段中对以下标签进行排序，并计算“临时”字段的总和：

0 =>     array (size=3)      'id_cra' => string '4586' (length=4)      'temps' => string '03:00:00' (length=8)      'date' => string '2013-06-03' (length=10) 
 1 =>     array (size=3)      'id_cra' => string '4587' (length=4)      'temps' => string '03:00:00' (length=8)      'date' => string '2013-06-06' (length=10) 
 2 =>     array (size=3)      'id_cra' => string '4588' (length=4)      'temps' => string '03:00:00' (length=8)      'date' => string '2013-06-05' (length=10)  
3 =>     array (size=3)      'id_cra' => string '4589' (length=4)      'temps' => string '03:00:00' (length=8)      'date' => string '2013-06-06' (length=10) 
 4 =>     array (size=3)      'id_cra' => string '4590' (length=4)      'temps' => string '03:00:00' (length=8)      'date' => string '2013-06-07' (length=10) 
 5 =>     array (size=3)      'id_cra' => string '4591' (length=4)      'temps' => string '02:00:00' (length=8)      'date' => string '2013-06-03' (length=10)  
6 =>     array (size=3)      'id_cra' => string '4592' (length=4)      'temps' => string '03:30:00' (length=8)      'date' => string '2013-06-03' (length=10)

预期结果：

date =＆gt; “Temps”字段的总和

2013-06-03 =>08:30:00
2013-06-06 =>06:00:00

等

PS：很抱歉，问一些对你来说可能很简单的事情，我已经在互联网上查了一下（比如这里：Sort array of objects by object fields），但我不明白答案

Answer 1

我没试过，但必须是这样的：

$arr = [your array data]; // your array which has to be sorted

usort($arr, 'sort_array');

function sort_array($a, $b) {

    $timeA = strtotime($a['date']);
    $timeB = strtotime($b['date']);

    if($timeA == $timeB) {
        return 0;
    }
    return $timeA < $timeB ? -1 : 1;
}

计算总和将是对数组进行排序之后的循环，您必须按日期“分组”并总结“临时数”

Answer 2

第一部分相当简单。我们可以使用array_multisort()按字段对字段的数据进行排序，如下所示：

<?php
$data = array(
    0 => array('id_cra' => '4586', 'temps' => '03:00:00', 'date' => '2013-06-03'),
    1 => array('id_cra' => '4587', 'temps' => '03:00:00', 'date' => '2013-06-06'),
    2 => array('id_cra' => '4588', 'temps' => '03:00:00', 'date' => '2013-06-05'), 
    3 => array('id_cra' => '4589', 'temps' => '03:00:00', 'date' => '2013-06-06'),
    4 => array('id_cra' => '4590', 'temps' => '03:00:00', 'date' => '2013-06-07'),
    5 => array('id_cra' => '4591', 'temps' => '02:00:00', 'date' => '2013-06-03'), 
    6 => array('id_cra' => '4592', 'temps' => '03:30:00', 'date' => '2013-06-03')
);

$tmp = array();
foreach($data as $k=>$r){
    $tmp[] = $r['date'];
}
array_multisort($tmp,SORT_DESC,$data);

echo '<pre>',print_r($data),'</pre>';

但是现在想要为每一天添加时间。这并不困难，但您将失去id_cra值。因此，对于下面的示例，我刚刚创建了一个新数组。如果您想要这样做，您应该能够使用这些信息将其构建回原始数组中。

date_default_timezone_set('America/New_York'); //set timezone
$midnight = mktime(0,0,0,date("n"),date("j"),date("Y")); // create a constant
$times = array();
foreach($data as $d){
     // get number of secs since const
    $time = strtotime(date("Y-m-d",$midnight).' '.$d['temps']) - $midnight;

    if(isset($times[$d['date']])){
        $times[$d['date']] += $time; // if day exists add secs
    }else{
        $times[$d['date']] = $time; // else set day with cur secs
    }
}

foreach($times as $k=>&$time){
    $time = date("Y-m-d H:i:s",strtotime($k)+$time); // reformat to date
}

echo '<pre>',print_r($times),'</pre>';

按字段对对象数组进行排序

2 个答案: