UPDATE
Just a quick note, as I can see this looks really stupid, and it has no good use with pure PHP because the array_merge just works there. BUT try it with the PHP MongoDB driver before you rush to downvote. That dude WILL add indexes for whatever reason, and WILL ruin the merged object. With my naïve little function, the merge comes out exactly the way it was supposed to with a traditional array_merge.
I know it's an old question but I'd like to add one more case I had recently with MongoDB driver queries and none of array_merge, array_replace nor array_push worked. I had a bit complex structure of objects wrapped as arrays in array:
$a = [
["a" => [1, "a2"]],
["b" => ["b1", 2]]
];
$t = [
["c" => ["c1", "c2"]],
["b" => ["b1", 2]]
];
And I needed to merge them keeping the same structure like this:
$merged = [
["a" => [1, "a2"]],
["b" => ["b1", 2]],
["c" => ["c1", "c2"]],
["b" => ["b1", 2]]
];
The best solution I came up with was this:
public static function glueArrays($arr1, $arr2) {
// merges TWO (2) arrays without adding indexing.
$myArr = $arr1;
foreach ($arr2 as $arrayItem) {
$myArr[] = $arrayItem;
}
return $myArr;
}