我正在尝试解决一个问题，我需要计算像“我的三明治”这样的食谱的营养价值
我有一个带有“食谱”和“成分”的数据库，以及千克所需的数量。
食谱可以包含成分，但也包含其他食谱，然后再次可以包含食谱/成分。
这是“测试三明治”的“部件列表”的示例，总重量为0.095千克。
array (
0 =>
array (
'id' => 2,
'name' => 'Test Cheese',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.015,
'depth' => 1,
),
1 =>
array (
'id' => 3,
'name' => 'Test Ham',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.03,
'depth' => 1,
),
2 =>
array (
'id' => 4,
'name' => 'Test Sesam Bread',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.05, // Only use some of the test bread (with added Sesam)
'depth' => 1,
'parts' =>
array (
0 =>
array (
'id' => 5,
'name' => 'Test Bread',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 1.0, // This a recipe for 1 kg of banana bread
'depth' => 2,
'parts' =>
array (
0 =>
array (
'id' => 6,
'name' => 'Test Flour',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.5,
'depth' => 3,
),
1 =>
array (
'id' => 7,
'name' => 'Test Water',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.3,
'depth' => 3,
),
2 =>
array (
'id' => 8,
'name' => 'Test Yeast',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.05,
'depth' => 3,
),
3 =>
array (
'id' => 9,
'name' => 'Test Banan',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.15,
'depth' => 3,
),
),
),
1 =>
array (
'id' => 10,
'name' => 'Test Sesam Seeds',
'metric_id' => 1,
'category_id' => NULL,
'quantity' => 0.1,
'depth' => 2,
),
),
),
)
如何将这种结构减少到每个“末端”成分的量/重量列表，如面粉，水，香蕉，奶酪，火腿，芝麻等？
我写了这个函数来运行结构，但它并没有真正完成这项工作（似乎正确计算总重量）
function resolveAssembly($items, $number = 1, $declaration = [])
{
$weight = 0;
foreach ($items as $item) {
// Get the quantity (weight) of the item
$amount = $item['quantity'];
// Check if the item also contains an ingredients list
if (array_key_exists('parts', $item)) {
// Get the total weight of the whole assembly
list($assembly_weight, $assembly_declaration) = resolveAssembly($item['parts'], $number * $amount, $declaration);
$declaration = array_merge($declaration, $assembly_declaration);
// Calculate the relative weight of each part in the assembly
foreach ($item['parts'] as $part) {
$weight = $weight + ($amount / $assembly_weight) * $part['quantity'];
}
} else {
// Add the amount to the declaration
if (!array_key_exists($item['name'], $declaration)) {
$declaration[$item['name']] = $number * $amount;
}
$weight = $weight + $amount;
}
}
return [$weight, $declaration];
}
编辑：合并程序集声明数组
这就是我使用上述功能的方法：
$item = Inventory::findOrFail(1); // Get "Test sandwich"
$parts = $item->getAssemblyItemsList(); // Get the parts of the "Test sandwich"
$result = resolveAssembly($parts, 1); // Get total weight of 1 "Test sandwich" + a list of amount/weight of each ingredient
resolveAssembly（）函数的当前结果：
0.095
[
"Test Cheese" => 0.015
"Test Ham" => 0.03
"Test Flour" => 0.025
"Test Water" => 0.015
"Test Yeast" => 0.0025
"Test Banan" => 0.0075
"Test Sesam Seeds" => 0.005 // Should have been factored in the bread ingredients
]
但它不太正确，它应该加起来0.095，所以测试Sesam种子不考虑面包由面粉（面粉，酵母，香蕉等）组成的东西。我想。
0.015 + 0.03 + 0.025 + 0.015 + 0.0025 + 0.0075 + 0.005 = 0.1 kg“测试三明治”
此外，如果这有帮助，我使用这个系统存储这些食谱：https://github.com/stevebauman/inventory/blob/v1.7/docs/ASSEMBLIES.md（但修改为存储十进制数字和负数（例如处理水丢失或添加做烹饪过程））
这里是为了总结“测试三明治”的总重量而进行的所有计算：
"Test Cheese: 0 + 0.015 = 0.015"
"Test Ham: 0.015 + 0.03 = 0.045"
"Test Flour: 0 + 0.5 = 0.5"
"Test Water: 0.5 + 0.3 = 0.8"
"Test Yeast: 0.8 + 0.05 = 0.85"
"Test Banan: 0.85 + 0.15 = 1"
"Test Flour: 0 + (1 / 1) * 0.5 = 0.5"
"Test Water: 0.5 + (1 / 1) * 0.3 = 0.8"
"Test Yeast: 0.8 + (1 / 1) * 0.05 = 0.85"
"Test Banan: 0.85 + (1 / 1) * 0.15 = 1"
"Test Sesam Seeds: 1 + 0.1 = 1.1"
"Test Bread: 0.045 + (0.05 / 1.1) * 1 = 0.09045454545"
"Test Sesam Seeds: 0.090454545454545 + (0.05 / 1.1) * 0.1 = 0.095"
这应该让你更接近：
function resolveAssembly($items) {
$weight = 0;
$declaration = [];
foreach ($items as $item) {
$weight += $item['quantity'];
if (array_key_exists('parts', $item)) {
// if there are parts, get the full weight and declaration for the sub item
list($sub_total_weight, $sub_declaration) = resolveAssembly($item['parts']);
foreach ($sub_declaration as $sub_name => $sub_weight) {
if (!array_key_exists($sub_name, $declaration)) {
$declaration[$sub_name] = 0;
}
// Total weight of particular ingredient is the sub items ingredient out of the sub items full weight
// times the quantity for this particular item
$declaration[$sub_name] += $item['quantity'] * ($sub_weight / $sub_total_weight);
}
} else {
// if there are no parts, just add the quantity
if (!array_key_exists($item['name'], $declaration)) {
$declaration[$item['name']] = 0;
}
$declaration[$item['name']] += $item['quantity'];
}
}
return [$weight, $declaration];
}
这会给你这个结果：
array(2) {
[0]=>
float(0.095)
[1]=>
array(7) {
["Test Cheese"]=>
float(0.015)
["Test Ham"]=>
float(0.03)
["Test Flour"]=>
float(0.022727272727273)
["Test Water"]=>
float(0.013636363636364)
["Test Yeast"]=>
float(0.0022727272727273)
["Test Banan"]=>
float(0.0068181818181818)
["Test Sesam Seeds"]=>
float(0.0045454545454545)
}
}
如果你将上面的数字相加，它们应该总计0.095。
基本上当你做一个“子食谱”时，你需要知道该食谱的总重量是多少，从那里你可以根据该子数量计算实际物品总数。