php: combine multiple arrays value into one array preserving keys - php

Question

I have multiple arrays structured like these:
$array1 = ["aaa" => 1, "bbb" => 1];
$array2 = ["aaa" => 12, "bbb" => 12];
$array3 = ["bbb" => 15, "ccc" => 15];
meaning:
every array has the same value for each key (eg: array1 has value "1" for every item in the array) but there are no arrays sharing the same value (eg: if array1 has value 1, then none of the other arrays has value = 1)
the arrays may or may not share the same keys
I need to combine these arrays in a way that the final result is something like this:
$result = [
"aaa" => [1,12],
"bbb" => [1,12,15],
"ccc" => [15],
];
meaning:
the final array must contain all the keys from the previous arrays
the value of the key is an array composed of all the values of the previous arrays that shared the same key
I know it's a bit messy, but I hope it is clear enough. I'm struggling to build the $result array. I tried merge, combine, intersect, but none of them seems to work. Is there a way to build the $result array without using a loop?
Thanks

Answer 1

Does it match your goal ?
<?php
$array1 = ["aaa" => 1, "bbb" => 1];
$array2 = ["aaa" => 12, "bbb" => 12];
$array3 = ["bbb" => 15, "ccc" => 15];
$array = array_merge_recursive($array1, $array2, $array3);
print_r($array);
?>
outputs
Array
(
[aaa] => Array
(
[0] => 1
[1] => 12
)
[bbb] => Array
(
[0] => 1
[1] => 12
[2] => 15
)
[ccc] => 15
)

Answer 2

Merge all of array into an mergedArray. Then use 2 foreach to set it.
<?php
$array1 = ["aaa" => 1, "bbb" => 1];
$array2 = ["aaa" => 12, "bbb" => 12];
$array3 = ["bbb" => 15, "ccc" => 15];
$mergedArray = [$array1, $array2, $array3];
$result = [];
foreach ($mergedArray as $array) {
foreach ($array as $key => $item) {
$result[$key][] = $item;
}
}
echo '<pre>';
print_r($result);
echo '</pre>';
exit;
?>
The result:
Array
(
[aaa] => Array
(
[0] => 1
[1] => 12
)
[bbb] => Array
(
[0] => 1
[1] => 12
[2] => 15
)
[ccc] => Array
(
[0] => 15
)
)