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run code in 200+ php & hhvm versions
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<?php $mapping = [ "AccountId" => "id", "Street" => "street_name", "Country" => "country", "Contacts" => "contacts", "Id" => "contact_id", "Name" => "name" ]; $input2 = [ "AccountId" => "18", "Street" => "Some Street 123", "Country" => "England", "Contacts" => [ [ "Id" => "1234", "Name" => "John Doe" ] ] ]; function mapArray($mapping, $input) { $output = []; foreach ($mapping as $from => $to) { if (array_key_exists($from, $input)) { if (is_array($input[$from])) { $output[$to] = mapArray($mapping, $input[$from]); } else { if ($from=="Name") { echo "wfoo";} $output[$to] = $input[$from]; } } } return $output; } $output2 = mapArray($mapping, $input2); var_dump($output2);
based on r4nqM

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Output for Arrow functions
array(4) { ["id"]=> string(2) "18" ["street_name"]=> string(15) "Some Street 123" ["country"]=> string(7) "England" ["contacts"]=> array(0) { } }

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