我不知道是否有一种简单的方法可以完成我想做的事情,所以我想我也应该问一下。我确实在寻找这个问题的答案,但找不到类似的东西。
我有一个名为$data
的变量,它包含一个看起来像这样的集合:
[
"date" => "2017-10-07 10:00:00"
"usage" => 0.423
"costs" => 1.212
],
[
"date" => "2017-10-07 11:00:00"
"usage" => 0.786
"costs" => 1.564
],
[
"date" => "2017-10-07 12:00:00"
"usage" => 0.542
"costs" => 1.545
]
(数据可以长达2个月的每小时记录,出于可读性考虑,我在此示例中选择仅包含3个小时)
如您所见,全部都是每小时每小时(这也是我代码中不同部分所需的数据),我希望每天单独收集。有没有一种简单的方法可以按日期('Ymd')分组并求和usage
和costs
?我还应该提到并非集合中的所有项目都具有所有索引。有些没有usage
,有些没有costs
。所有人都有date
。
答案 0 :(得分:2)
您可以通过以下方式实现此目标:
$collection = collect([
[
"date" => "2017-10-07 10:00:00",
"usage" => 0.423,
"costs" => 1.212
],
[
"date" => "2017-10-07 11:00:00",
"usage" => 0.786,
"costs" => 1.564
],
[
"date" => "2017-10-07 12:00:00",
"usage" => 0.542,
"costs" => 1.545
],
[
"date" => "2017-10-08 10:00:00",
"costs" => 1.1
],
[
"date" => "2017-10-08 11:00:00",
"usage" => 0.786,
],
[
"date" => "2017-10-08 12:00:00",
"costs" => 1.567
]
]);
return $collection->groupBy(function($row) {
return Carbon\Carbon::parse($row['date'])->format('Y-m-d');
})->map(function($value, $key) {
return [
'usage' => $value->sum('usage'),
'costs' => $value->sum('costs')
];
});
以上内容的输出为:
Collection {#267 ▼
#items: array:2 [▼
"2017-10-07" => array:2 [▶]
"2017-10-08" => array:2 [▼
"usage" => 0.786
"costs" => 2.667
]
]
}
从上面可以看到,某些项目没有usage
或costs
。它仍然可以工作。
这也是您可以玩的example。