计算不同单位的关联数组

Question

我正在尝试将具有多种单位类型的特定危险元素的所有数量相加。如果未列出该单位，那么它就不会被包括在内（例如，没有 0 值）。然后 return 一个基于替代键格式的总计数组。

我自己会尝试，但我想我会把它弄得一团糟。有人可以建议一种优雅的方法来计算我的元素数组以获得所需的结果吗？

数组：

//Raw Data to be caculated

Array ( 
    [0] => Array ( [hazard] => irritant [quantity] => 1 [unit] => F)
    [1] => Array ( [hazard] => corrosive [quantity] => 2 [unit] => F ) 
    [2] => Array ( [hazard] => health [quantity] => 1 [unit] => F ) 
    [3] => Array ( [hazard] => toxic [quantity] => 1 [unit] => F ) 
    [4] => Array ( [hazard] => environmental [quantity] => 4 [unit] => l )       
    [5] => Array ( [hazard] => health [quantity] => 1 [unit] => l ) 
    [6] => Array ( [hazard] => toxic [quantity] => 2 [unit] => l ) 
    [7] => Array ( [hazard] => irritant [quantity] => 4 [unit] => g ) 
    [8] => Array ( [hazard] => corrosive [quantity] => 2 [unit] => g ) 
    [9] => Array ( [hazard] => toxic [quantity] => 3 [unit] => g ) 
    [10] => Array ( [hazard] => irritant [quantity] => 3 [unit] => K ) 
    [11] => Array ( [hazard] => toxic [quantity] => 2 [unit] => K ) 
    [12] => Array ( [hazard] => environmental [quantity] => 1 [unit] => V ) 
    [13] => Array ( [hazard] => health [quantity] => 2 [unit] => V ) 
    [14] => Array ( [hazard] => irritant [quantity] => 2 [unit] => l ) 
    [15] => Array ( [hazard] => toxic [quantity] => 3 [unit] => l ) 
    [16] => Array ( [hazard] => corrosive [quantity] => 3 [unit] => g ) 
    [17] => Array ( [hazard] => environmental [quantity] => 4 [unit] => g )) 

    etc

想要的结果：

//Array of totaled unit types

Array ( 
   [irritant] => Array( [g] => 4 [l] => 12, [K] => 5, [F] => 2),  
   [corrosive] => Array( [g] => 3 [l] => 7, [K] => 5),
   [hazard] => Array( [g] => 12 [l] => 18, [V] => 2)) 

   etc

Answer 1

在插入/更新目标数组的结果之前，您需要创建一个目标数组并循环遍历原始数组进行测试和计算。像这样：

<?php
$clean = array();
foreach ($raw_array as $r) {
    $type = $r['hazard'];
    $unit = (isset($r['unit'])) ? $r['unit'] : "";
    $qty = $r['quantity'];
    if (!empty($r['unit'])) // or any other filter for the units
    {
        $clean[$type][$unit] = (isset($clean[$type][$unit])) ?
            $clean[$type][$unit] + $qty :
            $qty;
    }
}
?>

现在您的 $clean 变量保存具有所需结构的信息。

计算不同单位的关联数组

calculating an associative array of different units

php

associative-array