对多维PHP数组进行分组并为每个数组元素计算特定键的总和 [英] Grouping multidimensional PHP array and calculating sum of a particular key for each arrays element
问题描述
我有一个数组，其中包含有关所有项目的数据.
I had an array which had data about all projects.
我需要按'year_actual'元素对数组进行分组.
I needed to group the array by 'year_actual' element.
我已成功使用php函数"array_group_by"完成了此分组，该函数可在此处使用: https://gist.github.com/mcaskill/baaee44487653e1afc0d
I have successfully done this grouping using a php function "array_group_by" which is available here: https://gist.github.com/mcaskill/baaee44487653e1afc0d
这是我分配给变量的分组数组:$ projects_grouped_by_year
Here is my grouped array which I assigned to a variable: $projects_grouped_by_year
Array
(
[2016] => Array
(
[0] => Array
(
[id] => 1
[project_name] => P1
[project_capacity] => 100
[year_actual] => 2016
[companies] => Array
(
[0] => Array
(
[id] => 1
[project_id] => 1
[company_type] => C1
[capacity_share] => 12
[project_year] => 2016
)
[1] => Array
(
[id] => 2
[project_id] => 1
[company_type] => C2
[capacity_share] => 14
[project_year] => 2016
)
)
)
[1] => Array
(
[id] => 2
[project_name] => P2
[project_capacity] => 200
[year_actual] => 2016
[companies] => Array
(
[0] => Array
(
[id] => 3
[project_id] => 2
[company_type] => C2
[capacity_share] => 15
[project_year] => 2016
)
[1] => Array
(
[id] => 4
[project_id] => 2
[company_type] => C1
[capacity_share] => 16
[project_year] => 2016
)
)
)
)
[2014] => Array
(
[0] => Array
(
[id] => 3
[project_name] => P3
[project_capacity] => 300
[year_actual] => 2014
[companies] => Array
(
[0] => Array
(
[id] => 5
[project_id] => 3
[company_type] => C1
[capacity_share] => 20
[project_year] => 2014
)
[1] => Array
(
[id] => 6
[project_id] => 3
[company_type] => C2
[capacity_share] => 22
[project_year] => 2014
)
)
)
[1] => Array
(
[id] => 4
[project_name] => P4
[project_capacity] => 400
[year_actual] => 2014
[companies] => Array
(
[0] => Array
(
[id] => 7
[project_id] => 4
[company_type] => C2
[capacity_share] => 11
[project_year] => 2014
)
[1] => Array
(
[id] => 8
[project_id] => 4
[company_type] => C1
[capacity_share] => 10
[project_year] => 2014
)
)
)
)
)
我正在操纵上述数组以创建新的以下结果数组:我将创建一个新数组，并将计算出的值插入此新数组中:
I am manipulating above array to create a new following resultant array: I will create a new array and insert the calculated values in this new array:
Array
(
[0] => Array(
//year_actual of project
'year' => 2016,
//[100+200] : sum of 'project_capacity' where year_actual = 2016
'project_capacity_sum' => 300,
//[12+16] : sum of 'capacity_share' where company_type = C1 and project_year = 2016
'C1_capacity_sum' => 28,
//[14+15] : sum of 'capacity_share' where company_type = C2 and project_year = 2016
'C2_capacity_sum' => 29
)
[1] => Array(
//year_actual of project
'year' => 2014,
//[300+400] : sum of 'project_capacity' where year_actual = 2014
'project_capacity_sum' => 700,
//[20+10] : sum of 'capacity_share' where company_type = C1 and project_year = 2014
'C1_capacity_sum' => 30,
//[22+11] : sum of 'capacity_share' where company_type = C2 and project_year = 2014
'C2_capacity_sum' => 33
)
);
我成功使用以下代码计算了"project_capacity_sum"字段:
I have succeeded in calculating the field "project_capacity_sum" using the below code:
$ projectCapacitySum = array_map(function($ data){返回array_sum(array_column($ data，'project_capacity'));}，$ projects_grouped_by_year);
但是我正在努力计算最近两天的其他字段.
But I am struggling to calculate other fields for the last two days.
对我来说唯一有用的列如下:
The only useful columns to me are following:
[project_capacity]和[year_actual]
[project_capacity] and [year_actual]
在"companies"子数组内部
Inside "companies" sub array
[company_type]和[capacity_share]
[company_type] and [capacity_share]
基本上，我正在尝试按"year_actual"对数组进行分组(我已经完成了)然后找到每年的总"project_capacity"，以及每年的每个"company_type"的总"capacity_share".我希望这是有道理的.
Basically I am trying group the array by "year_actual" (which i have already done) Then find the total "project_capacity" in each year and also total "capacity_share" for each "company_type" in each year. I hope this makes sense.
如果我们使用[companies]子数组中的[project_year]列来实现所需的输出，就没有问题.
There is no problem if we use column [project_year] inside the [companies] sub array to achieve the desired output.
我知道我必须在companies子数组中进行另一个小组的工作，而我仍在尝试这样做.
I know that I have to do another group by inside the companies sub array..and I am still trying to do so.
我现在不关心代码效率或优化.我只是在寻找一种可行的逻辑.
I am not concerned about code efficiency or optimization at this point. I am just looking for a working logic.
我正在寻求帮助.请帮助我.
I am asking for help. Please help me with this.
谢谢.
推荐答案
要获得所需的结果，请扩展您的初始解决方案( array_map + array_sum + array_column )，方法如下:
To get the needed result extend your initial solution (array_map + array_sum + array_column) with the following approach:
$sumData = array_map(function ($v) {
$arr = ['year' => current(array_column($v, 'year_actual'))];
$arr['project_capacity_sum'] = array_sum(array_column($v, "project_capacity"));
$arr['C2_capacity_sum'] = $arr['C1_capacity_sum'] = 0;
foreach ($v as $item) { // iterating through the nested items
$c_capacities = array_column($item['companies'], 'capacity_share', 'company_type');
$arr['C1_capacity_sum'] += $c_capacities['C1'];
$arr['C2_capacity_sum'] += $c_capacities['C2'];
}
return $arr;
}, $projects_grouped_by_year);
print_r($sumData);
输出:
Array
(
[2016] => Array
(
[year] => 2016
[project_capacity_sum] => 300
[C1_capacity_sum] => 28
[C2_capacity_sum] => 29
)
[2014] => Array
(
[year] => 2014
[project_capacity_sum] => 700
[C1_capacity_sum] => 30
[C2_capacity_sum] => 33
)
)
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