How can I merge two arrays into one [closed] - php

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I've looked on this site and have found a few examples of merging arrays but to be honest, I'm not sure which one is right for me.
I am having a difficult time trying to merge these arrays. I've tried array_combine and array_merge but I am not having any luck.
What I need is a single array with the output like this:
Array
(
[0] => Array
(
[UnitNo] => 91
[Name] => Receiving
[ActivityNo] =>
[Active] => 2
[CallNo] =>
[CallStatusNo] =>
[Assigned] =>
[UnitId] => 2
)
[1] => Array
(
[UnitNo] => 83
[Name] => Shipping
[ActivityNo] =>
[Active] =>
[CallNo] =>
[CallStatusNo] =>
[Assigned] =>
[UnitId] => 1
)
)
These are the two arrays that I need to merge together based on the UnitId that should form a complete array like the one above. I just don't know how to do this. If someone could direct me a bit, I would be grateful.
// Array #1
Array
(
[0] => Array
(
[UnitId] => 2
[UnitNo] => 91
[Name] => Receiving
[Active] => 4
)
[1] => Array
(
[UnitId] => 1
[UnitNo] => 83
[Name] => Shipping
[Active] => 4
)
)
// Array #2
Array
(
[0] => Array
(
[UnitId] => 2
[ActivityNo] => 1
[CallNo] => 1
[CallStatusNo] => 1
[Assigned] => 1
)
[1] => Array
(
[UnitId] => 1
[ActivityNo] => 11
[CallNo] => 2
[CallStatusNo] => 1
[Assigned] => 1
)
)

Answer 1

This isn't a case where you can just use a php function and call it good - you will have to do some custom logic of your own.
This would work, but only if both $array1 and $array2 have the same items at each index.
$array1;
$array2;
$mergedArray;
for ($i=0; $i++; $i < count($array1) - 1) {
//first add all the values from array1
$mergedArray[$i] = $array1[$i];
foreach($array2[$i] as $array2Key=>$array2Value){
//now check for missing key/values that are in array2 but not in array1
if (array_key_exists($array2Key, $array1[$i]) == false) {
// the key does not exist in array1, so add it to mergedArray
$mergedArray[$i][$array2Key] = $array2Value;
}
}
}
It would be safer if your arrays were associative arrays, indexed by a unique value.