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<?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)), fn($result, $key) => array_merge( $result, [$key => ucwords(str_replace(['_', '-'], ' ', $key))] ), [] ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'one' => 'One', 'two-two' => 'Two Two', 'four' => 'Four', 'three' => 'Three', )

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