PHP combine two multi-dimensional arrays?

Array_merge_recursive gets you very close (your "key" is in index 1 of leaf arrays, and your value is in index 0). So do it in two steps: first get the merged array, then fiddle with the branches to get it right.

The result you're looking for looks really custom to me. That is to say, I don't know of any built-in PHP array functions that would do that. However, I did write a custom function for you.

Warning: it is very tailored to this occasion and thus probably not very reusable.

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