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    <p><code>array_merge_recursive</code> 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.</p> <pre><code>// This is a callback for array_map() which should have some more generic uses. // array(array('k', 'v'), ...) -&gt; array('k' =&gt; 'v', ...) function flatten_branches($branches) { $newleaves = array(); foreach ($branches as $leaf) { $newleaves[$leaf[0]] = $leaf[1]; } return $newleaves; } function merge_flatten_branches($karray, $varray) { //$karray has the key-leaves, and $varray has the value-leaves $m1 = array_merge_recursive($karray, $varray); return array_map('flatten_branches', $m1); } $merged = merge_flatten_branches($array2, $array1); print_r($merged); </code></pre> <p>Just for fun, here are two more approaches. Both of these are a bit slower than <code>merge_flatten_branches</code>, but illustrate some useful array concepts. (In other more functional-flavored languages than php, these might be preferred.)</p> <pre><code>function merge_flatten_branches_reduce($karray, $varray) { //$karray has the key-leaves, and $varray has the value-leaves $m1 = array_merge_recursive($karray, $varray); return array_map('flatten_branches_reduce', $m1); } function merge_flatten_branches_add($karray, $varray) { //$karray has the key-leaves, and $varray has the value-leaves $m1 = array_merge_recursive($karray, $varray); return array_map('flatten_branches_add', $m1); } // The functions below are callbacks for the two above. function array_add($a1, $a2) { return $a1+$a2; } function flatten_leaf($leaf) { return array($leaf[0] =&gt; $leaf[1]); } function flatten_branches_add($branches) { $leaves = array_map('flatten_leaf', ($branches)); $finalleaves = array(); foreach ($leaves as $leaf) { $finalleaves += $leaf; } return $finalleaves; } function flatten_branches_reduce($branches) { $l = array_map('flatten_leaf', ($branches)); return array_reduce($l, 'array_add', array()); } </code></pre>
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    1. USFrancis Avila
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    1. COThis is very cool Francis. Your solutions were spot-on. Exactly the result I was looking for. Now I just need to wrap my head around how it was done. Many thanks.
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    2. COWrap your head around _how it was done_? I, on the other hand, am just trying to understand what the heck is terminology is supposed to mean. All that `flatten_leaf` stuff is rather esoteric. Cryptic function names...not cool. If this was a clever, yet meaningless, function name contest, `merge_flatten_branches_reduce` would win with flying colours lol. Nevertheless, +1 for a working solution.
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