Online PHP editor | refs for NfXnF

<?php $array = [ 'vehicle info' => [ 'one' => [ 'submodel' => 'LX', 'engine' => 2.3 ], 'two' => [ 'color' => 'blue', 'year' => 2007, 'wheels' => 4 ], 'three' => [ 'submodel' => 'LX', 'make' => 'Ford', 'model' => 'F-150', 'offroad' => 'No' ] ] ]; $soughtKeys = array_flip(['submodel', 'offroad']); function earlyReturningRecursion(array $array, array $soughtKeys, array &$result = []): array { foreach ($array as $key => $value) { if (!array_diff_key($soughtKeys, $result)) { return $result; } elseif (is_array($value)) { earlyReturningRecursion($value, $soughtKeys, $result); } elseif (isset($soughtKeys[$key]) && !isset($result[$key])) { $result[$key] = "$key is $value"; } } return $result; } var_export(earlyReturningRecursion($array, $soughtKeys));