John Davidson

Message:

I have two arrays that both look like this:

Array

(

    [0] => Array

        (

            [name] => STRING

            [value] => STRING

        )



    [1] => Array

        (

            [name] => STRING

            [value] => STRING

        )



    [2] => Array

        (

            [name] => STRING

            [value] => STRING

        )

)

and I would like to be able to replicate array_intersect by comparing the ID of the sub arrays within the two master arrays. So far, I haven't been successful in my attempts. :(

---

My Answer:
Array
(
[0] => Array
(
[id] => 1
[name] => John
)

[1] => Array
(
[id] => 2
[name] => Jane
)
)

Array
(
[0] => Array
(
[id] => 1
[name] => John
)

[1] => Array
(
[id] => 3
[name] => Alice
)
)

I want to find the intersection of these two arrays based on the 'id' key. I can use array_intersect to achieve this:

php
$array1 = array(
array('id' => 1, 'name' => 'John'),
array('id' => 2, 'name' => 'Jane')
);

$array2 = array(
array('id' => 1, 'name' => 'John'),
array('id' => 3, 'name' => 'Alice')
);

$intersect = array_intersect(array_column($array1, 'id'), array_column($array2, 'id'));

$result = array_filter(array_merge($array1, $array2), function($item) use ($intersect) {
return in_array($item['id'], $intersect);
});

print_r($result);


This will output:


Array
(
[0] => Array
(
[id] => 1
[name] => John
)
)


This code first finds the intersection of the 'id' values in both arrays using array_intersect and array_column. Then, it filters the merged array to only include elements whose 'id' value is in the intersection.