我有一个数组，其中包含有关所有项目的数据。
我需要按'year_actual'元素对数组进行分组。
我已经使用php函数“ array_group_by”成功完成了此分组，该函数可在此处使用：https：//gist.github.com/mcaskill/baaee44487653e1afc0d
这是分配给变量的分组数组：$ 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一个新的以下结果数组：我将创建一个新数组并将计算出的值插入此新数组中：
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
)
);
我已使用以下代码成功计算了字段“ project_capacity_sum”：
$projectCapacitySum = array_map(function($data) { return 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。
对我来说唯一有用的列如下：
[project_capacity]和[year_actual]
内部“ companies”子数组
[company_type]和[capacity_share]
基本上，我想按“ year_actual”（已经完成）对数组进行分组，然后找到每年的“ project_capacity”总数，以及每年的每个“ company_type”的“ capacity_share”总数。我希望这是有道理的。
如果我们在[companies]子数组中使用[project_year]列来实现所需的输出，则没有问题。
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。
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。
我正在寻求帮助。请帮我解决一下这个。
谢谢。
为了获得所需的结果，请使用以下方法扩展您的初始解决方案（array_map+ array_sum+ array_column）：
$sumData = array_map(function ($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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