Merging 2 arrays keeping values from both - php

Question

I'm trying to merge to arrays using array_merge however I'm either not doing it right or this function doesn't do what I'm expecting.
Here I have 2 arrays
array_merge($array[0], $array[1]);
Array
(
[0] => Array
(
[apples] => 1
[pears] =>
[oranges] =>
[grapes] =>
[melons] => 1
)
[1] => Array
(
[apples] =>
[pears] => 1
[oranges] => 1
[grapes] =>
[melons] =>
[pineapples] =>
[bananas] =>
[lemons] =>
)
)
I'm getting this back, which is just seems to be using the second array
Array
(
[apples] =>
[pears] => 1
[oranges] => 1
[grapes] =>
[melons] =>
[pineapples] =>
[bananas] =>
[lemons] =>
)
But my desired outcome is:
Array
(
[0] => Array
(
[apples] => 1
[pears] => 1
[oranges] => 1
[grapes] =>
[melons] => 1
[pineapples] =>
[bananas] =>
[lemons] =>
)
)
Any help with this would be much appreciated.

Answer 1

From the manual:
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one.
If you want the ones from either that contain values to overwrite empty ones in either, then filter out the empties:
$result = array_merge(array_filter($array[0]), array_filter($array[1]));
However, if both arrays have the same key and they both have a value then this will still result in the second value. Also, this will not keep keys that are empty in both arrays like pineapples so you might need to loop and check what you want to include or not, or possibly:
$result = array_merge(array_merge(array_filter($array[0]), array_filter($array[1])),
array_filter($array[0]),
array_filter($array[1]));

Answer 2

Method I. Use array_walk_recursive
array_walk_recursive($a, function($v, $k) use (&$r){
isset($r[$k]) ? (!$v ? '' : ($r[$k] = $v)) : ($r[$k] = $v);
});
print_r($r);
Working example : https://3v4l.org/UpR2f
Method 2. Iterate using foreach with ternary operator
$r = [];
foreach($a as $k => $v){
foreach($v as $k1 => $v1){
isset($r[$k1]) ? ($v1==1 ? ($r[$k1] = $v1) : '') : ($r[$k1] = $v1);
}
}
Working example :- https://3v4l.org/WXCpd

Answer 3

If you want to keep keys that are empty in both arrays you can loop and merge the arrays by yourself.
You can take first array, that add keys from second array in foreach loop.
$result = $array[0];
foreach ($array[1] as $key => $value) {
if (empty($result[$key])) {
$result[$key] = $value;
}
}
This will keep the values from the first array if there are conflicting keys. If you rather want to keep the values from second array you can do following.
$result = $array[0];
foreach ($array[1] as $key => $value) {
$result[$key] = $value;
}