php - array_combine or array_merge? - php

Question

I'm sure this is easy for someone well-versed in php, but I've made the mistake of overloading my brain, so now I'm really confused as to whether I should use array_combine, array_merge, or something else... I've been googling and reading php.net for 4 hours and I think I'm just confusing myself even more...
Essentially, I just want to combine an array while keeping the keys?
//Here are the original arrays
[field_sreference] => Array
(
[0] => Array
(
[nid] => 28
)
[1] => Array
(
[nid] => 28
)
[2] => Array
(
[nid] => 29
)
)
[field_idelta] => Array
(
[0] => Array
(
[value] => 0
)
[1] => Array
(
[value] => 1
)
[2] => Array
(
[value] => 0
)
)
[field_iswitch] => Array
(
[0] => Array
(
[value] => 0
)
[1] => Array
(
[value] => 0
)
[2] => Array
(
[value] => 0
)
)
//Here is what I'm trying to achieve:
[combinedarray] => Array
(
[0] => Array
(
[nid] => 28
[idelta] => 0
[iswitch] => 0
)
[1] => Array
(
[nid] => 28
[idelta] => 1
[iswitch] => 0
)
[2] => Array
(
[nid] => 29
[idelta] => 0
[iswitch] => 0
)
)

Answer 1

You can solve this is O(n) by simply iterating the arrays...
$combinedarray = array();
$len = count($field_sreference);
for ($i = 0; $i < $len; $i++) {
$combinedarray[] = array("nid" => $field_sreference[$i]['nid'],
"idelta" => $filed_idelta[$i]['value'],
"iswitch" => $field_iswitch[$i]['value']);
}
This assumes, the 3 arrays are all of equal length.

Answer 2

A bit quickly typed, but this should work:
$result = array();
foreach ($arrays as $array)
{
foreach ($array as $index => $data)
{
$result[$index] += $data;
}
}
As you have not provided some input array in some easy form, you need to test it on your own. Let's say it's pseudo-code and I leave it here as an exercise. The + operator is the array union operator.