<?php $array = [ ["one" => 1, "two-two" => 2, "four" => 4], ["two-two" => 22, "three" => 33, "four" => 44] ]; var_export( array_reduce( array_keys(array_merge(...$array)), function($result, $key) { $result[$key] = ucwords(str_replace(['_', '-'], ' ', $key)); return $result; } ) );
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