我整天都在为多维数组创建一个merge function。场景有点不同，很难用语言描述。相反，我将尝试用一个实际的例子来解释它。
$actual_array = [
'assets' => [1, 2, 3],
'liabilities' => [1, 2, 3, 4, 5, 6],
'equity' => [1],
'income' => [1, 2, 3, 4],
'expenses' => [1, 2, 3]
];
$merge = [
'balance_sheet' => ['assets', 'liabilities', 'equity'],
'income' => ['income', 'expenses'],
];
self::merge( $merge, $actual_array );
该函数将合并指定的列，然后转置并填充结果。
public static function merge( array $merges, array $data )
{
$bigger_array_length = 0;
$arr = [];
$columns = [];
foreach ($merges as $key => $merge) {
foreach ($merge as $index => $column) {
//check which array has bigger length in the iteration
if($bigger_array_length < count($data[$column]))
$bigger_array_length = count($data[$column]);
$columns[] = $column;
}
//when i die and dump the columns array on its first iterate
dd($columns); // assets, liabilities, equity
if($bigger_array_length> 0) {
$total_columns = count($columns);// on first iteration 3 assets, liabilities and equity
for($i = 0; $i < $bigger_array_length; $i++) {
//
$arr[$key][] = [
$columns[$total_columns - 1] => isset($data[ $columns[$total_columns - 1] ][$i]) ? $data[ $columns[$total_columns - 1] ][$i] : 0,
$columns[$total_columns - 2] => isset($data[ $columns[$total_columns - 2] ][$i]) ? $data[ $columns[$total_columns - 2] ][$i] : 0,
$columns[$total_columns - 3] => isset($data[ $columns[$total_columns - 3] ][$i]) ? $data[ $columns[$total_columns - 3] ][$i] : 0
];
}
}
//when i die and dump on first iteration then it's just fine
array:1 [▼
"balance_sheet" => array:6 [▼
0 => array:3 [▼
"equity" => 1
"liabilities" => 1
"assets" => 1
]
1 => array:3 [▼
"equity" => 0
"liabilities" => 2
"assets" => 2
]
2 => array:3 [▼
"equity" => 0
"liabilities" => 3
"assets" => 3
]
3 => array:3 [▼
"equity" => 0
"liabilities" => 4
"assets" => 0
]
4 => array:3 [▼
"equity" => 0
"liabilities" => 5
"assets" => 0
]
5 => array:3 [▼
"equity" => 0
"liabilities" => 6
"assets" => 0
]
]
]
$columns = [];
}
}
我只是被困在这里，不知道如何让它动态化。
[$total_columns - 1] // the 1, 2, 3 or so on
//something like [$total_columns - $i]
因此，如果我让 foreach 运行第二次迭代，那么它会输出undefined index error .
e.x [$total_columns - 3] 将在第二次迭代时-1 index，因为第二次迭代只有 2 total columns 。
这将导致Undefined offset: -1.
我想要实现的目标：
"balance_sheet" => array:6 [▼
0 => array:3 [▼
"equity" => 1
"liabilities" => 1
"assets" => 1
]
1 => array:3 [▼
"equity" => 0
"liabilities" => 2
"assets" => 2
]
2 => array:3 [▼
"equity" => 0
"liabilities" => 3
"assets" => 3
]
3 => array:3 [▼
"equity" => 0
"liabilities" => 4
"assets" => 0
]
4 => array:3 [▼
"equity" => 0
"liabilities" => 5
"assets" => 0
]
5 => array:3 [▼
"equity" => 0
"liabilities" => 6
"assets" => 0
]
],
"income" => array:4 [▼
0 => array:2 [▼
"expenses" => 1
"income" => 1
]
1 => array:2 [▼
"expenses" => 2
"income" => 2
]
2 => array:2 [▼
"expenses" => 3
"income" => 3
]
3 => array:2 [▼
"expenses" => 0
"income" => 4
]
]
]
function spec_merge($arr) {
// find max length of array items
$m = max(array_map(count, $arr));
// fill array items to max length by 0
$a = array_map(function($i) use($m) {
return ($m - count($i)) ?
$i + array_fill(count($i), $m - count($i), 0) :
$i; },
$arr);
// make array of sourse keys
$keys = array_keys($a);
// transpose array
array_unshift($a, null);
$a = call_user_func_array("array_map", $a);
// set correct keys
$a = array_map(function ($i) use($keys) {
return array_combine($keys, $i); },
$a);
return $a;
}
$new = spec_merge([
'assets' => [1, 2, 3],
'liabilities' => [1, 2, 3, 4, 5, 6],
'equity' => [1]
]);
print_r($new);
结果
[[
[assets] => 1
[liabilities] => 1
[equity] => 1
][
[assets] => 2
[liabilities] => 2
[equity] => 0
][
[assets] => 3
[liabilities] => 3
[equity] => 0
][
[assets] => 0
[liabilities] => 4
[equity] => 0
][
[assets] => 0
[liabilities] => 5
[equity] => 0
][
[assets] => 0
[liabilities] => 6
[equity] => 0
]]
演示
我注意到发布的问题要求和接受的答案之间存在真正的脱节（它没有提供问题所要求的内容）;所以我决定自己写。
- 循环访问 2 个"配置"组（
balance_sheet和income）。 - 按当前组 （
$inclusions） 中指定的键隔离数据行 （$isolatedData）。 - 确定隔离数据中最长数组的长度（
$max）。 - 在
$isolatedData中循环$max次，并使用新的关联转置结构将值存储在结果数组中。 如果值不可用，请使用空合并运算符 （??） 分配回退值0。
代码：（演示）
class Helper
{
public static function populateCustomMatrices (array $data, array $conf): array
{
$result = [];
foreach ($conf as $groupName => $inclusions) {
$isolatedData = array_intersect_key($data, array_flip($inclusions));
for ($i = 0, $max = max(array_map('count', $isolatedData)); $i < $max; ++$i) {
foreach ($inclusions as $key) {
$result[$groupName][$i][$key] = $isolatedData[$key][$i] ?? 0;
}
}
}
return $result;
}
}
$data = [
'assets' => [1, 2, 3],
'liabilities' => [1, 2, 3, 4, 5, 6],
'equity' => [1],
'income' => [1, 2, 3, 4],
'expenses' => [1, 2, 3]
];
$conf = [
'balance_sheet' => ['assets', 'liabilities', 'equity'],
'income' => ['income', 'expenses'],
];
var_export(Helper::populateCustomMatrices($data, $conf));