如何比较具有不同项数的两个多维关联数组

Question

我有两个具有不同项目计数的多维关联数组。重要的是我不知道哪个数组有更多的元素(A或B)

第一个数组:

[0] => Array
(
[catID] => 65
[discount] => 10
[productID] => Array
(
[0] => 10887
[1] => 8508
[2] => 8350
)
[startDate] => 05/12/2022 12:00 am
[endDate] => 10/12/2022 12:00 am
)
[1] => Array
(
[catID] => 66
[discount] => 10
[productID] => Array
(
[0] => 13184
[1] => 10707
[2] => 8350
)
[startDate] => 10/12/2022 12:00 am
[endDate] => 15/12/2022 12:00 am
)

第二个数组(B):

[0] => Array
(
[catID] => 72
[discount] => 15
[productID] => Array
(
[0] => 16239
[1] => 16236
[2] => 10887
[3] => 13184
[4] => 8524
[5] => 13314
)
[startDate] => 12/12/2022 12:00 am
[endDate] => 15/12/2022 12:00 am
)

在比较这些数组(A, B)之后，我想检索这样的东西:

Array A(remove productID if exists in Array B):

[0] => Array
(
[catID] => 65
[discount] => 10
[productID] => Array
(
[1] => 8508
[2] => 8350
)
[startDate] => 05/12/2022 12:00 am
[endDate] => 10/12/2022 12:00 am
)
[1] => Array
(
[catID] => 66
[discount] => 10
[productID] => Array
(
[0] => 10707
)
[startDate] => 10/12/2022 12:00 am
[endDate] => 15/12/2022 12:00 am
)

数组B(未更改):

[0] => Array
(
[catID] => 72
[discount] => 15
[productID] => Array
(
[0] => 16239
[1] => 16236
[2] => 10887
[3] => 13184
[4] => 8524
[5] => 13314
)
[startDate] => 12/12/2022 12:00 am
[endDate] => 15/12/2022 12:00 am
)

Answer 1

填充扁平的"黑名单";

循环遍历第一个数组的行，并根据黑名单数组过滤productId值。

代码(演示):

$blacklist = array_merge(...array_column($b, 'productID'));
var_export(
array_map(
fn($row) => array_replace($row, ['productID' => array_values(array_diff($row['productID'], $blacklist))]),
$a
)
);

---

或者如果你不介意经典的foreach()，那么这可能更容易阅读:(Demo)

$blacklist = array_merge(...array_column($b, 'productID'));
foreach ($a as &$row) {
$row['productID'] = array_values(array_diff($row['productID'], $blacklist));
}
var_export($a);